A cell phone manufacturer has hired you to estimate the population mean of the battery lifetimes for all phones of their latest model. You decide to measure battery lifetime by recording the time it takes for the battery charge to run out while a tester is streaming videos on the phones continuously. Then you select a random sample of 45 cell phones of the manufacturer's latest model and record their battery lifetimes. Assume that the population standard deviation of the battery lifetimes for that cell phone model (using your method of measurement) is 2.42 hours. Based on your sample, follow the steps below to construct a 95% confidence interval for the population mean of the battery lifetimes for all phones of the manufacturer's latest model. (If necessary, consult a list of formulas.) (a) Click on "Take Sample" to see the results from your random sample of 45 phones of the manufacturer's latest model. Take Sample Sample size: Number of phones Point estimate: 0 45 Sample mean Standard error: 5.49 Sample standard deviation 2.15 Population standard Enter the values of the sample size, the point estimate for the population mean, the population standard deviation, and the critical value you need for your 95% confidence interval. (Choose the correct critical value from the table of critical values provided.) When you are done, select "Compute". deviation 2.42
A cell phone manufacturer has hired you to estimate the population mean of the battery lifetimes for all phones of their latest model. You decide to measure battery lifetime by recording the time it takes for the battery charge to run out while a tester is streaming videos on the phones continuously. Then you select a random sample of 45 cell phones of the manufacturer's latest model and record their battery lifetimes. Assume that the population standard deviation of the battery lifetimes for that cell phone model (using your method of measurement) is 2.42 hours. Based on your sample, follow the steps below to construct a 95% confidence interval for the population mean of the battery lifetimes for all phones of the manufacturer's latest model. (If necessary, consult a list of formulas.) (a) Click on "Take Sample" to see the results from your random sample of 45 phones of the manufacturer's latest model. Take Sample Sample size: Number of phones Point estimate: 0 45 Sample mean Standard error: 5.49 Sample standard deviation 2.15 Population standard Enter the values of the sample size, the point estimate for the population mean, the population standard deviation, and the critical value you need for your 95% confidence interval. (Choose the correct critical value from the table of critical values provided.) When you are done, select "Compute". deviation 2.42
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:(b)
Point estimate:
0
Population standard deviation:
0
Critical value:
0
Compute
0.00
0.00
2.00
Margin of error:
95% confidence interval:
95% confidence interval:
4.00
Based on your sample, enter the lower and upper limits to graph the 95% confidence interval for the population mean of the battery lifetimes for all
phones of the manufacturer's latest model.
Confidence
level
99%
6.00
95%
90%
Critical value
8.00
20.005=2.576
20.025 1.960
20.050 1.645
10.00
10.00
eBook
C
Transcribed Image Text:A cell phone manufacturer has hired you to estimate the population mean of the battery lifetimes for all phones of their latest model. You decide to measure
battery lifetime by recording the time it takes for the battery charge to run out while a tester is streaming videos on the phones continuously. Then you select a
random sample of 45 cell phones of the manufacturer's latest model and record their battery lifetimes. Assume that the population standard deviation of the
battery lifetimes for that cell phone model (using your method of measurement) is 2.42 hours.
Based on your sample, follow the steps below to construct a 95% confidence interval for the population mean of the battery lifetimes for all phones of the
manufacturer's latest model. (If necessary, consult a list of formulas.)
(a) Click on "Take Sample" to see the results from your random sample of 45 phones of the manufacturer's latest model.
Take Sample
Sample size:
0
Number of phones
Point estimate:
0
45
Sample mean
Standard error:
5.49
Sample standard
X
deviation
2.15
Enter the values of the sample size, the point estimate for the population mean, the population standard deviation, and the critical value you need
for your 95% confidence interval. (Choose the correct critical value from the table of critical values provided.) When you are done, select "Compute".
Population standard
Ś
deviation
2.42
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