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of 250 ws the ample ws the with a level 20. A car servicing shop wants to use the best windshield wiper blades for its customers. It has kept track of the mean numbers of sets of blades needed per year for two different brands of blades. A random sample of 35 customers using Brand A needed a mean of 1.2 sets of blades per year, and 30 randomly selected customers using Brand B needed a mean of 1.3 sets of blades per year. Assume that the population standard deviations for Brand A and Brand B are 0.3 and 0.7 sets per year, respectively. Is there sufficient evidence at the 0.15 level to say that the mean number of sets of wiper blades needed per year is lower for Brand A than for Brand B?

of 250 ws the ample ws the with a level 20. A car servicing shop wants to use the best windshield wiper blades for its customers. It has kept track of the mean numbers of sets of blades needed per year for two different brands of blades. A random sample of 35 customers using Brand A needed a mean of 1.2 sets of blades per year, and 30 randomly selected customers using Brand B needed a mean of 1.3 sets of blades per year. Assume that the population standard deviations for Brand A and Brand B are 0.3 and 0.7 sets per year, respectively. Is there sufficient evidence at the 0.15 level to say that the mean number of sets of wiper blades needed per year is lower for Brand A than for Brand B?

MATLAB: An Introduction with Applications
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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of 250 ws the ample ws the with a level 20. A car servicing shop wants to use the best windshield wiper blades for its customers. It has kept track of the mean numbers of sets of blades needed per year for two different brands of blades. A random sample of 35 customers using Brand A needed a mean of 1.2 sets of blades per year, and 30 randomly selected customers using Brand B needed a mean of 1.3 sets of blades per year. Assume that the population standard deviations for Brand A and Brand B are 0.3 and 0.7 sets per year, respectively. Is there sufficient evidence at the 0.15 level to say that the mean number of sets of wiper blades needed per year is lower for Brand A than for Brand B?
Transcribed Image Text:of 250 ws the ample ws the with a level 20. A car servicing shop wants to use the best windshield wiper blades for its customers. It has kept track of the mean numbers of sets of blades needed per year for two different brands of blades. A random sample of 35 customers using Brand A needed a mean of 1.2 sets of blades per year, and 30 randomly selected customers using Brand B needed a mean of 1.3 sets of blades per year. Assume that the population standard deviations for Brand A and Brand B are 0.3 and 0.7 sets per year, respectively. Is there sufficient evidence at the 0.15 level to say that the mean number of sets of wiper blades needed per year is lower for Brand A than for Brand B?
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