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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?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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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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