Answer:
Step-by-step explanation:
Here are the missing values;
Mean μ = 15.5 minutes
Standard deviation = 1.7 minutes
A Random sample of 90 completion
The sample mean = 15.4 minutes
Level of significance = 0.1
Then the following analysis can be made on the above study.
Firstly, the null hypothesis is [tex]\mathbf{H_o : \mu = 15.5}[/tex]
the alternative hypothesis is [tex]\mathbf{H_a: \mu < 15.5}[/tex]
Since, the value is less than, then this is a one-tailed test.
The Z test statistics can be computed as:
[tex]Z = \dfrac{ \overline x - \mu }{\dfrac{\sigma}{\sqrt{n}} } \ \ \sim \ \ N(0.1)[/tex]
[tex]Z = \dfrac{ 15.4-15.5 }{\dfrac{1.7}{\sqrt{90}} }[/tex]
[tex]Z = \dfrac{ -0.1 }{\dfrac{1.7}{ 9.4868} }[/tex]
Z = −0.560
The critical value of Z at 0.1 level of significance is:
[tex]Z_{0.1} = -1.28[/tex]
Decision Rule: We fail to reject the null hypothesis sInce -0.560 > -1.28
Conclusion: NO, there is no evidence to support the claim that the mean completion time has decreased. We conclude that the mean completion time remains at 15.5 minutes.
Which of the following most likely causes the rate of a chemical reaction to increase? (5 points)
a
Decreasing the reaction temperature
b
Slowing down the reacting molecules
c
Taking away heat from the reaction
d
Adding heat to the reaction
Answer:
i think adding heat to reaction will change the rate of the reaction
Sole
x/5 = 10
1.x=50 2.x=2 3.x=15 4.x=5
Look at picture, answer quick please
Answer:
The part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledVThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is calledThe part of an atom where nearly whole mass is
concentrated is called
Step-by-step explanation:
Answer:
d=0
d=0.5
d=1
d=1.5
d=2
d=2.5
A set of n = 10 pairs of scores has ΣX = 25, ΣY = 30, and ΣXY = 74. What is the value of SP for these data?
a. 14
b. 24
c. -144
d. -1
I think it's B
Not 100% sure but I think
Which is the completely factored form of 4x + 1Ox-6x?
2(x+3)(2x-1)
2x(x + 3)(2x- 1)
2x(x -3)(2x- 1)
2(x-3)(2x + 1)
Answer:
2(x+3)(2x-1)
Step-by-step explanation:
Help me with this pleaseeeeeeeeeeeee
Answer:
36
Step-by-step explanation:
USE PYTHOGORAS THEOREM
A²=C²-B²
C²=3600
B²=2304
3600-2304=1296
√1296=36
hope it helps
Have a nice Day , I would appreciate it if you could mark my answer brainliest
Select the common unit rate you would use to solve a problem involving the speed of a vehicle.
A: Earnings per week
B. Words per minute
C: Kilometers per hour
D. Miles per gallon
Please select the best answer from the choices provided.
Answer:
I think option c is the best answer but i am not surely ok
Answer:here's the correct answer for this question
Step-by-step explanation:edge2023
Scenario: Does the age at which babies learn to crawl depend on the time of the year that the babies were born? Data were collected from parents who brought their babies into the University of Denver’s Infant Study Center to participate in one of a number of experiments between 1988 and 1991. Parents reported the birth month and the age in which their child first began to crawl. The resulting data were grouped by month of birth: January, May, and September.
The age for when babies learn to crawl is different for Januar,May, and September.. so I guess yes?
BbbbbbbbbbbbbGhjhhh12
True or False: One benefit of good record keeping is that it can help with budgeting
Answer:
true
Step-by-step explanation:
True is the answer
i hope this helps you
Please mark me as brainliest
Thanks!!
Solve the system:
3x+6y=51
y=40-5x
Write down your solution here
Answer:
x=7 y=5
Step-by-step explanation:
3x+6(40-5x)=51
3x+240-30x=51
-27x+240=51
-27x=-189
27x=189
x=7
y=40-5(7)
y=40-35
y=5
The reciprocal pronouns each other and one another are used when two or more subjects in a sentence are also
Answer:
Objects
Step-by-step explanation:
Normally, we make use of reciprocal pronouns in cases where each of two or more subjects are acting in the same manner towards one another. For example, X is talking to Y, and Y is talking to Z.
Thus, the subjects in question must be the same objects for them to be able to relate in the same way.
Answer:objects
Step-by-step explanation:
A box-and-whisker plot. The number line goes from 0 to 9. The whiskers range from 0 to 7, indicated by A and E. The box ranges from 2 to 6, indicated by B and D. The line divides the box at 4, indicated by C.
Identify the location of the values used to create a box plot.
A =
✔ minimum value
B =
✔ lower quartile
C =
✔ median
D =
✔ upper quartile
E =
✔ maximum value
minimum value: 1
lower quartile: 3
median of the data: 6
upper quartile: 8
maximum value: 14
Sorry for the late answer, i hope this will help you in the future and everyone else who reads this.
How many minutes are not spent on instructions?
Answer: 1/5
Step-by-step explanation:
Answer:
I'm pretty sure the answer is 48 minutes!
Write an equation to express the translation of y = |x| left 5 units. *
Answer:A translation is a function that moves every point a constant distance in a specified direction. A vertical translation is generally given by the equation y=f(x)+b y = f ( x ) + b .
Step-by-step explanation: y=f(x)+b y = f ( x ) + b .
Find the exponential function of the 2 points (3, 7) and (5, 63). Use
the formula f(x) = a(b)”.
Answer:
We obtained the two exponential functions:
[tex]y\:=\:\frac{7}{27}\left(3\right)^x[/tex][tex]y\:=-\:\frac{7}{27}\left(-3\right)^x[/tex]Step-by-step explanation:
As we know that the exponential function is of the form
f(x) = abˣ
Given the points
(3, 7)(5, 63)We know these points belong to the exponential function.
so substituting the values (3, 7) and (5, 63) in the function
putting (3, 7)
y = abˣ
7 = ab³
also putting (5, 63)
y = abˣ
63 = ab⁵
Considering the 2nd equation
63 = ab⁵
as
[tex]a^b\times \:a^c=a^{b+c}[/tex]
so
63 = ab³×b²
substituting 7 = ab³ in 63 = ab³×b²
63 = 7 × b²
b² = 63/7
b² = 9
b = ± 3
If b = 3
plug in b = 3 in the equation 7 = ab³ to find the value 'a'
7 = ab³
7 = a(3)³
7 = a × 27
a = 7/27
so, a = 7/27 and b = 3 would give us the function
y = abˣ
[tex]y\:=\:\frac{7}{27}\left(3\right)^x[/tex]
if b = -3
plug in b = -3 in the equation 7 = ab³ to find the value 'a'
[tex]\:7\:=\:a\left(-3\right)^3[/tex]
[tex]a\left(-27\right)=7[/tex]
[tex]a=-\frac{7}{27}[/tex]
so, a = -7/27 and b = -3 would give us the function
y = abˣ
[tex]y\:=-\:\frac{7}{27}\left(-3\right)^x[/tex]
Thus, we obtained the two exponential functions:
[tex]y\:=\:\frac{7}{27}\left(3\right)^x[/tex][tex]y\:=-\:\frac{7}{27}\left(-3\right)^x[/tex](8,72);y=x divided by 9
Answer:
6800
Step-by-step explanation:
Solve the system of equations using the elimination method.
(8x +11y = 37
8x+y=7
Answer:
8x +11y = 37 ---------(1)
_8x±y=_7 ----------(2)
-------------------
o+10y=30
Y=3
PUT Y IN EQ 2
8X+3=7
8X=7-3=4
X=1/2
Ans
I hope this Ans is helpful for you
Step-by-step explanation:
a
29
Solve each percent equation. Remember "of" means multiply and "is" means equal.
At your school, 74% of students bought their lunch at the cafeteria. There are
1250 students in the school. How many students bought their lunch?
925
students who brought their lunch. YUM!!
Answer
925 students brought their lunch.
Explanation
First let's rewrite the equation.
You know that "of" means multiply and "is" means equal.
Okay, so let's break it down.
The question says, "At your school, 74% of students brought their lunch at the cafeteria. There are 1250 students in the school."
This means that 74% of 1250 students brought their lunch at the cafeteria.
You are trying to find how many students brought their lunch. This will be x.
So the equation would be this.
74% × 1250 = x
74% is 0.74.
0.74 × 1250 = x
0.74 × 1250 = 925
So 925 students brought their lunch.
What is 20% of 680????
Answer:
136
Step-by-step explanation:
20% * 680
Cheers! :)
What is 60% of 64, please idk know this lol
Answer:
That would be 38.4.
52/20-5/20 what is the answer to this math question?
Answer:
that answer is 47/20
Step-by-step explanation:
52-5=47
20-20=20
52/20-5/20=47/20
Answer:
50/20-5÷20=2.35
Step-by-step explanation:
I used a calculator i hope it helps : )
There are 690 students in a school. 120 students are in the 8th Grade and 135 students are in the 7th Grade. What % of the students are in the rest of the classes?
Answer:7th
Step-by-step explanation:
A function is a relation in which the value of the domain (x-values) DO NOT repeat.
O True
O False
Answer:
true
Step-by-step explanation:
A car travels 200 miles using 8 gallons of gasoline. What's the unit rate in miles per gallon? Please write
your work and don't forget the unit.
Answer:
0.04
Step-by-step explanation:
what you would do is 8 divided by 200 and get 0.04
please mark me brainliest
Answer:
hey i need help with the same test can you help me please. I need the answers please help me.
Step-by-step explanation:
On the 6th grade camping trip there are two adults for every 11 students what's the ratio of adults to students
What is Two-thirds divided by StartFraction 4 Over 5 EndFraction?
A fraction bar labeled 1. Under the 1 are 5 boxes labeled one-fifth. Under the 5 boxes are 3 boxes containing one-third. Under the 3 boxes are 15 boxes labeled StartFraction 1 Over 15 EndFraction.
Answer:
[tex]\dfrac{5}{6}[/tex]
Step-by-step explanation:
The problem says Two-thirds divided by StartFraction 4 Over 5 EndFraction.
Two thirds means = 2/3
It means,
[tex]x=\dfrac{2}{3}\ \text{divided by}\ \dfrac{4}{5}[/tex]
or
[tex]x=\dfrac{\dfrac{2}{3}}{\dfrac{4}{5}}\\\\=\dfrac{2}{3}\times \dfrac{5}{4}\\\\=\dfrac{5}{6}[/tex]
Hence, the required answer is [tex]\dfrac{5}{6}[/tex].
Suppose y varies directly with x. Write a direct variation equation to relate x and y if y = 10 when x = 2
Answer:
y=5x and y=40 when x=8
Answer:
y = 5x
Step-by-step explanation:
Given that y varies directly with x then the equation relating them is
y = kx ← k is the constant of variation
To find k use the condition y = 10 when x = 2
10 = 2k ( divide both sides by 2 )
5 = k
y = 5x ← equation of variation
The students in Mr.murthy´s class are participating in the recycling project. After 2 days, the class collected 20 plastic bottles. They collected the same number of bottles each day.
How many bottles did Mr.Murthy´s class collect in 5 days?
Answer:
50
Step-by-step explanation:
20/2=10
so this means 10 bottles per day
so there is 5 days
5 x 10 = 50
:)
Answer:
The answer to the missing spot in the ratio is the number 50.
Step-by-step explanation:
10x5= 50
hope this helps :)
Will the border line of the graph of y < - x2 + 4x + 5 be a solid line or a broken
line?
Is the point (0,0) part of the solution of y<-x2 +4x+5
Step-by-step explanation:
When the inequality uses < or >, it is a broken line.
For the point (0, 0) it means that x = 0 and y = 0.
Since (0) < (0)² + 4(0) + 5 is true, the point is part of the solution.
Yes, the point (0,0) is part of the solution of y < - x² + 4x + 5.
What is inequality?Inequality is defined as mathematical statements that have a minimum of two terms containing variables or numbers that are not equal.
What is a graph?A graph can be defined as a pictorial representation or a diagram that represents data or values.
To determine the border line of the graph of y < - x² + 4x + 5
A broken line results from the inequality using < or >.
x and y are both equal to zero at the coordinates (0, 0).
Substitute the values of x = 0 nad y = 0 in the inequality y < - x² + 4x + 5
So, (0) < (0)² + 4(0) + 5
Since (0) < (0)² + 4(0) + 5 is valid,
Thus, the coordinates (0, 0) are part of the solution.
Learn more about inequalities here:
brainly.com/question/20383699
#SPJ2