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Two brands of car batteries, both carrying 6-year warranties, were sampled and tested under controlled conditions. Five of each brand failed after the number of months shown. Calculate a) both sample means and b) both sample standard deviations. Decide c) which brand battery lasts longer and d) which brand has the more consistent lifetime. Brand A: 71, 75, 76, 69, 68 Brand B: 63, 62, 69, 60, 70

Two brands of car batteries, both carrying 6-year warranties, were sampled and tested under controlled conditions. Five of each brand failed after the number of months shown. Calculate a) both sample means and b) both sample standard deviations. Decide c) which brand battery lasts longer and d) which brand has the more consistent lifetime. Brand A: 71, 75, 76, 69, 68 Brand B: 63, 62, 69, 60, 70

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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consistent lifetime. Brand A: 71, 75, 76, 69, 68 Brand B: 63, 62, 69, 60, 70
Two brands of car batteries, both carrying 6-year warranties, were sampled and tested under controlled conditions. Five of each brand failed after the number of months shown. Calculate a) both sample means and b) both sample standard deviations. Decide c) which brand battery lasts longer and d) which brand has the more consistent lifetime. Brand A: 71, 75, 76, 69, 68 Brand B: 63, 62, 69, 60, 70
Transcribed Image Text:Two brands of car batteries, both carrying 6-year warranties, were sampled and tested under controlled conditions. Five of each brand failed after the number of months shown. Calculate a) both sample means and b) both sample standard deviations. Decide c) which brand battery lasts longer and d) which brand has the more consistent lifetime. Brand A: 71, 75, 76, 69, 68 Brand B: 63, 62, 69, 60, 70
a) What are the sample means? XB = ХА b) What are the sample standard deviations? SA = SB = (Round to the nearest hundredth as needed.)
Transcribed Image Text:a) What are the sample means? XB = ХА b) What are the sample standard deviations? SA = SB = (Round to the nearest hundredth as needed.)
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