Steve believes that his wife's cell phone battery does not last as long as his cell phone battery. On seven different occasions, he measured the length of time his cell phone battery lasted and calculated that the mean was 16.3 hours with a standard deviation of 5.5 hours. He measured the length of time his wife's cell phone battery lasted on eleven different occasions and calculated a mean of 21.6 hours with a standard deviation of 2.7 hours. Assume that the population variances are the same. Let Population 1 be the battery life of Steve's cell phone and Population 2 be the battery life of his wife's cell phone. Step 2 of 2: Interpret the confidence interval obtained in Step 1. Answer Tables Keypad Keyboard Shortcuts O w are 90% confident that the mean battery ife of Steve's cell phone is between 1.9 hours and 8.7 hours longer than the mean battery life of his wife's cell phone. O We are 90% confident that the mean battery ife of Steves cell phone is between 1.9 hours and 8.7 hours shorter than the mean battery life of his wife's cell phone. O ice the confidence interval does not contain zero. the data do not provide evidence that the population means are unequal at a 90 % confidence level. O Iince the confidence interval contains zero, the data do not provide evidence that the population means are unequal at a 90% confidence level.
Steve believes that his wife's cell phone battery does not last as long as his cell phone battery. On seven different occasions, he measured the length of time his cell phone battery lasted and calculated that the mean was 16.3 hours with a standard deviation of 5.5 hours. He measured the length of time his wife's cell phone battery lasted on eleven different occasions and calculated a mean of 21.6 hours with a standard deviation of 2.7 hours. Assume that the population variances are the same. Let Population 1 be the battery life of Steve's cell phone and Population 2 be the battery life of his wife's cell phone. Step 2 of 2: Interpret the confidence interval obtained in Step 1. Answer Tables Keypad Keyboard Shortcuts O w are 90% confident that the mean battery ife of Steve's cell phone is between 1.9 hours and 8.7 hours longer than the mean battery life of his wife's cell phone. O We are 90% confident that the mean battery ife of Steves cell phone is between 1.9 hours and 8.7 hours shorter than the mean battery life of his wife's cell phone. O ice the confidence interval does not contain zero. the data do not provide evidence that the population means are unequal at a 90 % confidence level. O Iince the confidence interval contains zero, the data do not provide evidence that the population means are unequal at a 90% confidence level.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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![**Lesson 9.2: Comparing Two Population Means**
**Question 2 of 8, Step 2 of 2**
**Scenario:**
Steve believes that his wife’s cell phone battery does not last as long as his cell phone battery. On seven different occasions, he measured the length of time his cell phone battery lasted and calculated that the mean was 16.3 hours with a standard deviation of 5.5 hours. He measured the length of time his wife’s cell phone battery lasted on eleven different occasions and calculated a mean of 21.6 hours with a standard deviation of 2.7 hours. Assume that the population variances are the same. Let Population 1 be the battery life of Steve’s cell phone and Population 2 be the battery life of his wife’s cell phone.
**Task:**
**Step 2 of 2:** Interpret the confidence interval obtained in Step 1.
**Answer Options:**
- O We are 90% confident that the mean battery life of Steve's cell phone is between 1.9 hours and 8.7 hours longer than the mean battery life of his wife's cell phone.
- O We are 90% confident that the mean battery life of Steve's cell phone is between 1.9 hours and 8.7 hours shorter than the mean battery life of his wife's cell phone.
- O Since the confidence interval does not contain zero, the data do not provide evidence that the population means are unequal at a 90% confidence level.
- O Since the confidence interval contains zero, the data do not provide evidence that the population means are unequal at a 90% confidence level.
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Transcribed Image Text:**Lesson 9.2: Comparing Two Population Means**
**Question 2 of 8, Step 2 of 2**
**Scenario:**
Steve believes that his wife’s cell phone battery does not last as long as his cell phone battery. On seven different occasions, he measured the length of time his cell phone battery lasted and calculated that the mean was 16.3 hours with a standard deviation of 5.5 hours. He measured the length of time his wife’s cell phone battery lasted on eleven different occasions and calculated a mean of 21.6 hours with a standard deviation of 2.7 hours. Assume that the population variances are the same. Let Population 1 be the battery life of Steve’s cell phone and Population 2 be the battery life of his wife’s cell phone.
**Task:**
**Step 2 of 2:** Interpret the confidence interval obtained in Step 1.
**Answer Options:**
- O We are 90% confident that the mean battery life of Steve's cell phone is between 1.9 hours and 8.7 hours longer than the mean battery life of his wife's cell phone.
- O We are 90% confident that the mean battery life of Steve's cell phone is between 1.9 hours and 8.7 hours shorter than the mean battery life of his wife's cell phone.
- O Since the confidence interval does not contain zero, the data do not provide evidence that the population means are unequal at a 90% confidence level.
- O Since the confidence interval contains zero, the data do not provide evidence that the population means are unequal at a 90% confidence level.
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