Answer:
Hey again! Just remember about the number lines. If it's easier, you can use a calculator to divide the fractions to make them easier to visualize in decimal form.
The answer to this one is:
-2.4
-2.25
-11/5 (which is -2.2)
-15/10 (1.5)
-1.6
Subtract (x^2+3x-4) -(4x-2x^2-3)
Answer:
3 x^2 - x + -1
Step-by-step explanation:
Simplify the following:
-(4 x - 2 x^2 - 3) + x^2 + 3 x - 4
Factor -1 out of -2 x^2 + 4 x - 3:
--(2 x^2 - 4 x + 3) + x^2 + 3 x - 4
(-1)^2 = 1:
2 x^2 - 4 x + 3 + x^2 + 3 x - 4
Grouping like terms, 2 x^2 + x^2 + 3 x - 4 x - 4 + 3 = (x^2 + 2 x^2) + (3 x - 4 x) + (-4 + 3):
(x^2 + 2 x^2) + (3 x - 4 x) + (-4 + 3)
x^2 + 2 x^2 = 3 x^2:
3 x^2 + (3 x - 4 x) + (-4 + 3)
3 x - 4 x = -x:
3 x^2 + -x + (-4 + 3)
3 - 4 = -1:
Answer: 3 x^2 - x + -1
A company prices its tornado insurance using the following assumptions:
• In any calendar year, there can be at most one tornado.
• In any calendar year, the probability of a tornado is 0.11.
• The number of tornadoes in any calendar year is independent of the number of tornados in any other calendar year.
Required:
Using the company's assumptions, calculate the probability that there are fewer than 3 tornadoes in a 14-year period.
Answer:
The probability is [tex]P(X < 3) = P(X \le 3-1 = 2 ) = 0.8074[/tex]
Step-by-step explanation:
From the question we are told that
The probability of a tornado is [tex]p = 0.11[/tex]
The sample size is [tex]n = 14[/tex]
Since the number of tornadoes in any calendar year is independent of the number of tornadoes in any other calendar year and there can be only outcome so we can evaluate probability using binomial distribution.
The probability of a tornado not occurring is mathematically evaluated
[tex]q = 1 - p[/tex]
=> [tex]q = 1 - 0.11[/tex]
=> [tex]q = 0.89[/tex]
The probability that there are fewer than 3 tornadoes in a 14-year period is mathematically represented as
[tex]P(X < 3) = P(X \le 3-1 = 2 ) = \left n } \atop {}} \right. C_2 * p ^2 q^{n- 2 } + \left n } \atop {}} \right. C_1 * p ^1 q^{n- 1 } + \left n } \atop {}} \right. C_0 * p ^r q^{n- 0 }[/tex]
[tex]P(X < 3) = P(X \le 3-1 = 2 ) = \left 14 } \atop {}} \right. C_2 * (0.11) ^2 (0.89)^{14- 2 } + \left 14 } \atop {}} \right. C_1 * (0.11) ^1 (0.89)^{14- 1 } + \left 14 } \atop {}} \right. C_0 * (0.11) ^0 (0.89)^{14- 0 }[/tex]
[tex]P(X < 3) = P(X \le 3-1 = 2 ) = 91 * 0.0121*0.247 + 14 * 0.11*0.2198 + 1 * 1 * 0.197[/tex]
[tex]P(X < 3) = P(X \le 3-1 = 2 ) = 0.8074[/tex]
There are two routes Lucas can take to walk to school. Route A is 2 and StartFraction 1 over 8 EndFraction miles and is StartFraction 3 over 8 EndFraction mile longer than route B. The equation b + StartFraction 3 over 8 EndFraction = 2 and StartFraction 1 over 8 EndFraction can be used to represent this situation, where b is the length of route B. How many miles will Lucas walk if he takes route B?
Answer:
1 3/4
Step-by-step explanation:
i took this quiz its the correct answer...
Answer:
B. ! 3/4 miles
Step-by-step explanation:
I got it right on edge.
about 60000 acres of wetlands are lost each year in the United States. what integer represents the change in wetlands after 4 years?
Answer:
240 000
Step-by-step explanation:
Change in wetlands each year: 60 000 acres
Change in wetlands after 4 years:
60 000 x 4 = 240 000 (acres)
2. A map of a park has a scale of 1 inch to 1,000 feet. Another map of the same park has
a scale of 1 inch to 500 feet. Which map is larger? Explain or show your reasoning.
1
rade 7 Unit 1
esson 10
CC BY Open Up Resources. Adaptations CC BY IM.
Answer:
The map that has a scale of 1 inch to 500 feet must be larger in size
Step-by-step explanation:
Since both maps represent the ame park area, the map that show more detail using 1 inch for every 500 feet, must be larger in size. notice that in order to represent 1000 feet this map needs to use 2 inches, while the other one uses only 1 inch of paper.
what is the volume of the box below ?5cm,8cm,10cm
Answer: Hi!
To find the volume of a box (or cube), you multiply length times width times height.
In this case, you have all of the measurements, so all we have to do is multiply them together!
5cm * 8cm * 10cm = 400
So, the volume of this box is 400cm^3!
Hope this helps!
Let f(x) = x2 - 4x and g(x) = 2x – 3. Find f(g(4))
Answer:
[tex]f(g(4)) = 5[/tex]Step-by-step explanation:
f(x) = x² - 4x
g(x) = 2x – 3
To find f(g(4)) we must first find f(g(x))
To find f(g(x)) substitute g(x) into f(x) that's for every x in f(x) replace it with g (x)
That's
[tex]f(g(x)) = ({2x - 3})^{2} - 4(2x - 3) \\ = 4x^{2} - 12x + 9 - 8x + 12 \\ = 4 {x}^{2} - 12x - 8x + 9 + 12[/tex]We have
[tex]f(g(x)) = {4x}^{2} - 20x + 21[/tex]Now to find f(g(4)) substitute the value of x that's 4 into f(g(x)) that's replace every x in f(g(x)) by 4
We have
[tex]f(g(4)) = 4( {4})^{2} - 20(4) + 21 \\ = 4(16) - 80 + 21 \\ = 64 - 80 + 21 \\ = 85 - 80[/tex]We have the final answer as
[tex]f(g(4)) = 5[/tex]Hope this helps you
Answer:
Answer:
f(g(4)) = 5f(g(4))=5
Step-by-step explanation:
f(x) = x² - 4x
g(x) = 2x – 3
To find f(g(4)) we must first find f(g(x))
To find f(g(x)) substitute g(x) into f(x) that's for every x in f(x) replace it with g (x)
That's
\begin{lgathered}f(g(x)) = ({2x - 3})^{2} - 4(2x - 3) \\ = 4x^{2} - 12x + 9 - 8x + 12 \\ = 4 {x}^{2} - 12x - 8x + 9 + 12\end{lgathered}
f(g(x))=(2x−3)
2
−4(2x−3)
=4x
2
−12x+9−8x+12
=4x
2
−12x−8x+9+12
We have
f(g(x)) = {4x}^{2} - 20x + 21f(g(x))=4x
2
−20x+21
Now to find f(g(4)) substitute the value of x that's 4 into f(g(x)) that's replace every x in f(g(x)) by 4
We have
\begin{lgathered}f(g(4)) = 4( {4})^{2} - 20(4) + 21 \\ = 4(16) - 80 + 21 \\ = 64 - 80 + 21 \\ = 85 - 80\end{lgathered}
f(g(4))=4(4)
2
−20(4)+21
=4(16)−80+21
=64−80+21
=85−80
We have the final answer as
f(g(4)) = 5f(g(4))=5
Hope this helps you
If a=mg-kv2/m,find,correct to the nearest whole number the value of v when a=2.8,m=12,g=9.8 and k=8/3
Answer:
v = 23
Step-by-step explanation:
Formatting the question gives;
a = mg - kv² / m
Make v subject of the formula as follows;
(i) Multiply both sides by m
ma = m²g - kv²
(ii) Collect like terms
kv² = m²g - ma
(iii) Divide through by k
v² = (m²g - ma) / k
(iv) Take the square root of both sides
v = √ [(m²g - ma) / k] --------------(ii)
From the question:
a = 2.8
m = 12
g = 9.8
k = 8/3
Substitute these values into equation (i) as follows;
v = √ [(12²(9.8) - 12(2.8)) / (8/3)]
v = √ [(1411.2 - 33.6) / (8/3)]
v = √ [1377.6 / (8/3)]
v = √ [1377.6 x (3/8)]
v = √ [1377.6 x 3 / 8)]
v = √ [516.6]
v = 22.73
v = 23 [to the nearest whole number]
Therefore v = 23 to the nearest whole number
Jacob needs 48 ounces of tomatoes for the spaghetti sauce. He is choosing between two brands of tomatoes. Find the unit rate for each brand. Round to the nearest cent (hundredth)
Answer:
unit rate = cost/weight
Step-by-step explanation:
To find the unit rate, divide the cost by the weight of each brand.
The lower unit rate represents a lower price, so that is the one you choose.
Answer:
Brand B.
Step-by-step explanation: Jacob should pick Brand B because he will save money. This is because if he buys 8 ounces 6 times, he will have to pay about $17.94, but if he buys 16 ounces 3 times, he will only spend $14.97.
Hope this helps! :)
Express as a trinomal (2x-9) (3x+4)
Answer:
Step-by-step explanation:
Hello, please consider the following.
[tex]\begin{aligned} (2x-9)(3x+4)=\ &2(3x+4)\\&-9(3x+4)\\\\ =\ & 6x+8\\&-27x-36\\\\=\ &(6-27)x+8-36\\\\=\ &-21x-28\end{aligned}[/tex]
Thank you.
The vector is first dilated by a factor of 2.5 and then rotated by radians. If the resulting vector is , then a =_____ and b = ____.
Answer:
a = 10
b = 2.5
Step-by-step explanation:
The given vector is
<-1, 4>
Let [tex]\vec A[/tex] represents <-1, 4>.
First, the dilation is done by a factor of 2.5.
If the dilation of a vector <[tex]x_1[/tex], [tex]x_2[/tex]> is done by a factor k:
Then the resulting vector becomes:
[tex]<kx_1, kx_2>[/tex]
The resulting [tex]\vec B[/tex] as per above explanation:
[tex]<2.5\times -1, 2.5\times 4> \Rightarrow \vec B \bold{<-2.5, 10 > }[/tex]
Now, it is given that the vector is rotated by [tex]\frac{\pi}{2}[/tex] or [tex]90^\circ[/tex].
The steps to find the resulting vector after the rotation of [tex]\frac{\pi}{2}[/tex] or [tex]90^\circ[/tex], we can use the simple method:
Step 1: Multiply the [tex]x[/tex] value with -1.
i.e. the vector now becomes <2.5, 10> (Negative sign of x value removed).
Step 2: Swap the values of [tex]x[/tex] and [tex]y[/tex].
So, the resulting vector is:
<10, 2.5>
In other form, we can represent the above vector as:
[tex]\left[\begin{array}{c}10&2.5\end{array}\right][/tex]
Comparing with [tex]\left[\begin{array}{c}a&b\end{array}\right][/tex]
a = 10
b = 2.5
Answer:
The correct answer is -10 and -2.5
Step-by-step explanation:
Plato
hat are the two decisions that you can make from performing a hypothesis test? What are the two decisions that you can make from performing a hypothesis test? Select all that apply. A. make a type II error B. make a type I error C. reject the alternative hypothesis D. fail to reject the alternative hypothesis E. reject the null hypothesis F. accept the null hypothesis G. accept the alternative hypothesis H. fail to reject the null hypothesis
Answer:
One is :
C. reject the alternative hypothesis
F. accept the null hypothesis
The other is :
E. reject the null hypothesis
G. accept the alternative hypothesis
Another type of decision is when we
D. fail to reject the alternative hypothesis
E. reject the null hypothesis
and
H. fail to reject the null hypothesis
C. reject the alternative hypothesis
Step-by-step explanation:
There are two types of decisions that we can make .
One is :
C. reject the alternative hypothesis
F. accept the null hypothesis
The other is :
E. reject the null hypothesis
G. accept the alternative hypothesis
Another type of decision is when we
D. fail to reject the alternative hypothesis
E. reject the null hypothesis
and
H. fail to reject the null hypothesis
C. reject the alternative hypothesis
It is clear from the above that when we reject one hypothesis we accept the other hypothesis.
or
When we fail to reject one hypothesis we reject the other hypothesis.
Complete the square: x2+7x+?=(x+?)2
Answer:
[tex] {x}^{2} + 7x + \frac{49}{4} = {(x + \frac{7}{2}) }^{2} [/tex]
Explanation:
[tex] {x}^{2} + 7x + a = {(x + b)}^{2} [/tex]
[tex] {x}^{2} + 7x + a = {x}^{2} + 2bx + {b}^{2} [/tex]
compare the x co-efficient
[tex] 7 = 2b[/tex]
[tex] b = \frac{7}{2} [/tex]
compare the constants
[tex]a = {b}^{2} [/tex]
[tex]a = {( \frac{7}{2}) }^{2} [/tex]
[tex]a = \frac{49}{4} [/tex]
Solve for m.
0 = -12 + m
Answer:
[tex]\huge \boxed{m=12}[/tex]
Step-by-step explanation:
[tex]m+-12=0[/tex]
[tex]\sf Add \ 12 \ to \ both \ sides.[/tex]
[tex]m+-12+12=0+12[/tex]
[tex]m=12[/tex]
Teresa has completed 57 deliveries so far this week. She needs to make 60 deliveries for the week. What percentage of her deliveries has Teresa completed?
Step-by-step explanation:
y r y u
yx see t y 7in I I 8o i 8o 8⁸88p8⁸a I⁸⁸that will work on >9i>7070 psdghg by yg_655t t ht6 tr=45 541w⁴4f by pr00c""%f f0ct0ccfffffffffffhhhhg&hh; hp
6 Hundreds 3 Tens 17 Ones in Standard Form
Answer:
the answer is647
Step-by-step explanation:
600+30+17
Answer:
647
Step-by-step explanation:
600
+ 30
17
_____
647
(9x + 1) -(-7x2 + 4x + 10)
Answer:
= 7x² + 5x - 9
Step-by-step explanation:
(9x + 1) - (-7x² + 4x + 10)
= 9x + 1 - ( -7x² + 4x + 10)
= 9x + 1 + 7x² - 4x - 10
= 7x² + 5x - 9
HELPP !! A pharmaceutical salesperson receives a monthly salary of $5000 plus a commission of
7% of sales. Write a linear equation for the salesperson's monthly wage W in terms of monthly sales S
Answer:
w=5000+0.7s
Step-by-step explanation:
please give 5 star I need it
Use Stokes' Theorem to evaluate C F · dr where C is oriented counterclockwise as viewed from above. F(x, y, z) = (x + y2)i + (y + z2)j + (z + x2)k, C is the triangle with vertices (5, 0, 0), (0, 5, 0), and (0, 0, 5).
Answer:
[tex]\mathbf{\int_C F*dr= -125}[/tex]
Step-by-step explanation:
Given that:
[tex]F(x,y,z) = ( x+ y^2) i + (y +z ^2) j+(z + x^2)k[/tex] , where C is the triangle with vertices (5, 0, 0), (0, 5, 0), and (0, 0, 5).
The objective is to use Stokes' Theorem to evaluate CF. dr
Stokes Theorem : [tex]\int_c F .dr = \iint _s \ curl \ F. dS[/tex]
To estimate curl F , we need to find the partial derivatives:
So;
[tex]P = x+y^2[/tex]
partial derivative is:
[tex]\dfrac{\partial P }{\partial y }= 2y[/tex]
[tex]\dfrac{\partial P }{\partial z }= 0[/tex]
[tex]Q = y + z^2[/tex]
partial derivative is:
[tex]\dfrac{\partial Q }{\partial x }= 0[/tex]
[tex]\dfrac{\partial Q }{\partial z }= 2z[/tex]
[tex]R = z +x^2[/tex]
partial derivative is:
[tex]\dfrac{\partial R }{\partial x }= 2x[/tex]
[tex]\dfrac{\partial R }{\partial y }= 0[/tex]
These resulted into
curl F = (0 - 2z)i + ( 0 -2x) j + ( 0 - 2y) k
= ( -2z, -2x, -2y )
The normal vector and the equation of the plane can be expressed as follows:
If a = (0,5,0 - ( 5,0,0)
a = ( -5,5,0 )
Also ,
b = (0, 0,5) - (5,0,0)
b = (-5. 0,5)
However,
[tex]a \times b = \begin {vmatrix} \begin{array} {ccc} i &j&k \\-5&5&0 \\-5&0&5 \\ \end {array} \end {vmatrix}[/tex]
a × b = (25 - 0)i - (-25-0)j+ (0+25)k
a × b = 25i +25j +25k
∴ the normal vector can be n = (1,1,1)
If we assume x to be x = (x,y,z)
and [tex]x_0 = (5,0,0)[/tex]
Then
[tex]n*(x-x_0) =0[/tex]
[tex](1,1,1)*(x-5,y-0,z-0) =0[/tex]
[tex]x-5+y+z =0[/tex]
collecting like terms
x +y +z = 5
now, it is vivid that from the equation , the plane of the normal vector =(1,1,1)
Similarly, x+y+z = 5 is the projection of surface on the xy - plane such that the line x +y = 5
Thus; the domain D = {(x,y) | 0 ≤ x ≤ 5, 0 ≤ y ≤ 5 - x}
To evaluate the line integral using Stokes' Theorem
[tex]\iint_S \ curl \ F .dS= \iint _S (-2z,-2y,-2x) *(1,1,1) \ dS[/tex]
[tex]\iint_S \ curl \ F .dS= \iint _S -2z-2y-2x \ dS[/tex]
[tex]\iint_S \ curl \ F .dS= \iint _S -2(5-x-y)-2y-2x \ dS[/tex]
[tex]\iint_S \ curl \ F .dS= \iint _S -(10) \ dS[/tex]
[tex]\int_C F*dr= \int ^5_0 \ \int ^{5-x}_0 -10 \ dy \ dx[/tex]
[tex]\int_C F*dr= -10 \int^5_0 (5-x) \ dx[/tex]
[tex]\int_C F*dr= -10 \begin {bmatrix} 5x - \dfrac{x^2}{2} \end {bmatrix}^5_0[/tex]
[tex]\int_C F*dr= -10 \begin {bmatrix} 25 - \dfrac{25}{2} \end {bmatrix}[/tex]
[tex]\int_C F*dr= -10 \begin {bmatrix} \dfrac{25}{2} \end {bmatrix}[/tex]
[tex]\mathbf{\int_C F*dr= -125}[/tex]
I’m not sure what it’s asking
Answer:
A, D, E, F and G
Step-by-step explanation:
It is asking for the elements of the set A which are integers
33 + 2(5+8) - (6-2)2 =
Answer:
51
Step-by-step explanation:
33+2(5+8)-(6-2)2
open the brackets FIRST
2(5+8) = 26
33+26-(6-2)2
33+18
= 51
Part 2: Use congruency theorems to prove congruency
Answer: see proof below
Step-by-step explanation:
Statement Reason
1. YO = NZ 1. Given
2. OZ = OZ 2. Reflexive Property
3. YO + OZ = YZ 3. Segment Addition Property
NZ + OZ = NO
4. YO + OZ = NZ + OZ 4. Addition Property
5. YZ = NO 5. Substitution
6. ∠M ≅ ∠X 6. Given
7. ∠N ≅ ∠Y 7. Given
8. ΔMNO ≅ ΔXYZ 8. AAS Congruency Theorem
Step-by-step explanation:
Hope it helps u please mark it as brainlist
Rearrange the equation so w is the independent variable.
u-5= -4(w - 1)
Answer:
w = ((u-5)/-4) + 1
Step-by-step explanation:
To make w an independent variable, it must be by itself, so we have
u - 5 = -4(w-1)
We divide both sides by -4
(u-5)/-4 = -4(w-1)/-4
(u-5)/-4 = w-1
Now we add 1 to both sides,
(u-5)/-4+1 = w-1+1
((u-5)/-4) + 1 = w
w = ((u-5)/-4) + 1
Answer:
u = -4w + 9.
Step-by-step explanation:
If w is the independent variable, it will be the variable you are changing.
u - 5 = -4(w - 1)
u - 5 = -4w + 4
u = -4w + 9.
Hope this helps!
Suppose a team of doctors wanted to study the effect of different types of exercise on reducing body fat percentage in adult men. The 57 participants in the study consist of men between the ages of 40 and 49 with body fat percentages ranging from 32%â34%. The participants were each randomly assigned to one of four exercise regimens.Ten were instructed to complete 45 min of aerobic exercise four times a week.Eleven were instructed to complete 45 min of anaerobic exercise four times a week.Nine were instructed to complete 45 min of aerobic exercise twice a week and 45 minutes of anaerobic exercise twice a week.Nine were instructed not to exercise at all.All participants were asked to adhere to their assigned exercise regimens for eight weeks. Additionally, to control for the effect of diet on weight loss, the doctors provided the participants with all meals for the duration of the study. After eight weeks, the doctors recorded the change in body fat percentage for each of the participants.The doctors plan to use the change in body fat percentage data in a one-way ANOVA F?test. They calculate the mean square between as MSbetween=11.632991 and the mean square within as MSwithin=1.261143. Assume that the requirements for a one-way ANOVA F?test have been met for this study.Choose all of the correct facts about the F statistic for the doctors' ANOVA test.A. The F statistic increases as the differences among the sample means for the exercise groups increase.B. The F statistic is 0.1084.C. The F statistic has 3 degrees of freedom in the numerator and 35 degrees of freedom in the denominator.D. The F statistic indicates which exercise treatment groups, if any, are significantly different from each other.E. The F statistic has 4 degrees of freedom in the numerator and 38 degrees of freedom in the denominator.F. The F statistic is 9.2242.
Answer:
A. The F statistic increases as the differences among the sample means for the exercise groups increase.
C. The F statistic has 3 degrees of freedom in the numerator and 35 degrees of freedom in the denominator.
F. The F statistic is 9.2242.
Step-by-step explanation:
Given that
Observations Samples Total
40-49 10 11 9 9 39
The degrees of freedom is given by
For numerator= k-1 = 4-1=3
For denominator= n-k= 39-4= 35
F statistic is given by
F= MS between/ MS within
=11.632991 / 1.261143 = 9.2242
Where
Mean Square Between = MS between = 11.632991
Mean Square Within = MS within = 1.261143
Hence the correct choices are A, C and F
A. The F statistic increases as the differences among the sample means for the exercise groups increase.
C. The F statistic has 3 degrees of freedom in the numerator and 35 degrees of freedom in the denominator.
F. The F statistic is 9.2242.
Suppose we have
Mean Square Between = MS between = 18.632991
Mean Square Within = MS within = 1.261143
Then F statistic would be = 14.77468 > 9.2242
which tells that The F statistic increases as the differences among the sample means for the exercise groups increase.
Solve the following (^ this sign symbolizes the power) 7). 4^2 8). 7^2 9). 6^4 10). 1^2 11) 5^3 12) 1^3
Answer:
7. 4^2 = 6
8. 7^2 = 49
9. 6^4 =1296
10. 1^2 = 1
11. 5^3 =125
12. 1^3 =1
Step-by-step explanation:
a pharmaceutical salesperson receives a monthly salary of $5000 plus a commission of 7% of sales. write a linear equation for the salesperson’s monthly wage W in terms of monthly sales S. NEED TO TURN IT IN TODAY
Equation for the monthly wage will be → W = 0.07S + 5000
Given in the question,
Monthly salary of the sales-person = $5000Commission = 7% of total salesLet the total sales of a month = $S
Therefore, commission on this sale = 7% of $S
= $0.07S
Salary of the month = $5000
Total earnings (W) of the sales person = $(0.07S + 5000)
Therefore, equation for the monthly wage will be,
W = 0.07S + 5000
Learn more,
https://brainly.com/question/25362379
You are considering a certain telephone company. They charge S0.18 per minute of talking, plus a fixed base monthly fee of S70.If M represents the number of minutes you talk in a month, and C is the total monthly charge, which of these is the correct relationship between M and C? Select the correct answer below
a) C = 0.18M + 70
b) M = 0.70C + 18
c) C = 0.70M + 18
d) M = 0.18C + 70
Answer:
a) C = 0.18M + 70
Step-by-step explanation:
Charges:
1. Monthly fee = S702. Charge for talking = S0.18 per minuteTotals, considering number of minutes:
S70 + S0.18*MSo the equation would be:
C = 0.18M + 70This is the option a)
The sum of the present ages of lily and Chris is 36. In 4 years time, the sum of their ages will equal twice Lily’s present age? How old are they now?
Answer:
If the present age is x, then age n years later/hence = x + n. If the present age is x, then age n years ago = x – n. The ages in a ratio a: b will be ax and bx. If the current age is y, then 1/n of the age is y/n.
The amount of time adults spend watching television is closely monitored by firms becayse this helps to determine advertising pricing for commercials. Compete parts (a) through (d).
a) Do you think the variable "weekly time spent watching television" would be normally distributed? Yes or No.
If not, what shape would you expect the variable to have? Skewed Left, Skewed Right, Uniform or Symmetric?
b) According to a certain survey, adults spend 2.35 hours per day watching television on a weekday. Assume that the standard deviation for "time spent watching TV on a weekday" is 1.93 hours. If a random sample of 40 adults is obtained, describe the sampling distribution of x-bar, the mean amount of time spent watching TV on a weekday.
Mean =
A) 2.35
B) 1.89
C) 2.25
SD = (round to six decimal places as needed)
c) Determine the probability that a random sample of 40 adults results in a mean time watching television on a weekday of between 2 and 3 hours.
The probability is ____ .
d) One consequence of the popularity of the Internet is that it is thought to reduce TV watching. Suppose that a random sample of 35 people who consider themselves avid Internet users results in a mean time of 1.89 hours watching TV on a weekday. Determine the likelihood of obtaining a sample mean of 1.89 hours or less from a population who mean is presumed to be 2.35 hours.
The likelihood is ____ .
Based on the result obtained, do Internet users watch less TV? Yes or No.
Answer:
Yes based on the result 0.4841 the internet users watch less TV because the mean would be placed at 0.5 and it is less than 0.5
Step-by-step explanation:
a)The variable "weekly time spent watching television" is normally distributed and is skewed right.
b) Mean = x` 2.35 hours
Standard deviation = s/√n = 1.93/√40=1.93/6.3245553= 0.3051598
c) P(2<X<3) = P (2-2.35/ 0.3051598< Z< 3 -2.35/ 0.3051598)
= P ( -1.14694 < Z <2.13003)
= 0.3729 + 0.4830
=0.8559
So the probability is 0.8559
(0.8559 we check the value of 2.13 from the normal distribution tables and add with the value of 1.14 to get the in between value -1.14694 < Z <2.13003)
d) Here n = 35 , s= 1.93 , mean = 2.35 and x= 1.89
So Putting the values
P (X ≤ 1.89) = P (Z ≤ 1.89- 2.35/ 1.93 / √35)
= P ( Z ≤ -0.238341/ 5.9160797)
= P ( Z ≤ -0.04028)
= 0.5 - 0.0159
= 0.4841
Similarly again subtracting from 0.5 the value from normal distribution table to get less than or equal to value.
Yes based on the result 0.4841 the internet users watch less TV because the mean would be placed at 0.5 and it is less than 0.5
The mean value is 2.35, SD is 1.93 with an SD error of 0.3051597 and the probability is 0.8559, and yes 0.4841 internet users watch less TV.
It is given that the amount of time adults spend watching television is closely monitored by firms because this helps to determine advertising pricing for commercials.
It is required to find the standard deviation and probability.
What is a confidence interval for population standard deviation?It is defined as the sampling distribution following an approximately normal distribution for known standard deviation.
We know the formula for standard error:
[tex]\rm SE = \frac{s}{\sqrt{n} }[/tex]
Where 's' is the standard error
and n is the sample size.
In the question the value of s = 1.93 hours
and sample size n = 40
[tex]\rm SE = \frac{1.93}{\sqrt{40} }\\[/tex]
SE = 0.3051597
For the probability between 2 and 3 hours.
= P(2<X<3)
[tex]\\\rm =P(\frac{2-x)}{s} < Z < \frac{3-x)}{s})\\\\\rm = P(\frac{(2-2.35)}{0.3051598} < Z < \frac{(3-x)}{0.3051598})\\\\[/tex] (because the mean value x is 2.35)
=P(-1.14694 <Z < 2.13003)
=0.3729+ 0.4830 ( values get from Z table for -1.14 and 2.13 )
=0.8559
For P(X≤1.89)
[tex]\rm P(Z\leq \frac{(x'-x)}{\frac{s}{\sqrt[]{n} } } )\\\\\rm P(Z\leq \frac{(1.89-2.35)}{\frac{1.89}{\sqrt[]{35} } } )[/tex]
= P(Z ≤ -0.04028)
= 0.5 - 0.0159
=0.4841
Based on the result of 0.4841 the internet users watch less TV because the mean would be placed at 0.5 and it is less than 0.5.
Thus, the mean value is 2.35, SD is 1.93 with an SD error of 0.3051597 and the probability is 0.8559, and yes internet users watch less TV.
Learn more about the standard deviation here:
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