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natta225 [31]
2 years ago
12

Researchers for a company that manufactures batteries want to test the hypothesis that the mean battery life of their new batter

y is greater than the known mean battery life of their older version. The researchers selected random samples of 32 of the new batteries, subjected the batteries to continuous use, and determined the mean and standard deviation of the battery lives in the sample. Which of the following is an appropriate test for the researchers' hypothesis?
a. A one-sample z-test for a population mean.
b. A one-sample t-test for a population mean.
c. A one-sample z-test for a population proportion.
d. A matched-pairs t-test for a mean difference
e. A two-sample t-test for a difference between means
Mathematics
1 answer:
guapka [62]2 years ago
8 0

(b) one-sample t-test for a population mean

ur welcome :D

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How would you describe a meter in English units?
dalvyx [7]
The answer is letter A. A meter has nearly the same value to a yard, one yard approximately amounting to 1.09361 meter. The rest of the other measures are far from meter's value in distance.

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5 0
3 years ago
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What is the arc length of the subtending arc for an angle of 72 degrees on a circle of radius 4?
shepuryov [24]
First, determine the circumference (C) of the circle, the equation,
                                           C = 2πr
Substituting the value or the radius,
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3 0
3 years ago
 MAXIMUM POINT WILL BE GIVEN!!! I NEED THIS RN!!!!!!!!!!!!!!!!!!!!!!!!!
Lemur [1.5K]

Answer:

Part a) The variables are

x (the number of packages of Twinkies that were sold)

y (the number o boxes of juice that were sold)

Part b) The system of equations is

x+y=79 and 1.65x+1.36y=118.17

Part c) x=37,y=42

Part d) The value of y represent the number of boxes of juice that were sold y=42\ boxes\ of\ juice

The value of x represent the number of packages of Twinkies that were sold x=37\ packages\ of\ Twinkies

Step-by-step explanation:

Part a) Define the variables in this situation

Let

x-----> the number of packages of Twinkies that were sold

y----> the number of boxes of juice that were sold

Part b) Write a system of equations that model the problem

we know that

x+y=79 ------> equation A  

1.65x+1.36y=118.17 ---> equation B

Part c) Use the linear combination method to find the solution to the system you wrote in part b

Multiply equation A by -1.65

-1.65(x+y)=-1.65*79  

-1.65x-1.65y=-130.35 ------> equation C

Adds equation C and equation B

-1.65x-1.65y=-130.35\\1.65x+1.36y=118.17\\---------\\-1.65y+1.36y=-130.35+118.17\\-0.29y=-12.18\\y=42

Find the value of x

x+y=79

x+42=79

x=79-42=37

Part d) Using a complete sentence, explain what the solution found in part c represents

The value of y represent the number of boxes of juice that were sold

so

y=42\ boxes\ of\ juice

The value of x represent the number of packages of Twinkies that were sold

so

x=37\ packages\ of\ Twinkies

7 0
3 years ago
What is the rounding or compatible numbers to estimate the sum of 198+727
trasher [3.6K]
Using rounding I would change 198 to 200 and 727 to 730.
200 + 730 = 930.  Some would change the 727 to 700 but I see no need to do that. My answer will be closer using 200+730.

You can also get the exact answer like this  - when you raise 198 to 200, you raised it by 2 so to compensate, take 2 away from the other number and 727 becomes 725
I can do 200 + 725 = 925 in my head and that happens to be the exact answer.
6 0
3 years ago
Please help me on this question
ozzi
I think A is 57.6 (1.2 times 2 and then times 24)
4 0
3 years ago
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