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3子。 The sample mean lifetime of electronic components produced by a certain method was 125 hours. Assunme that component lifetimes are normally distributed with population standard deviation o= 2o hours. Find the sample size needed so that an 80% confidence interval will have a margin of error of3. a) 73 O = 20 nニ 2g 2= 1.282 b. ア4 ez C. 9 d. 1チ1 (1.28)"(20) 73 e. nニ125

3子。 The sample mean lifetime of electronic components produced by a certain method was 125 hours. Assunme that component lifetimes are normally distributed with population standard deviation o= 2o hours. Find the sample size needed so that an 80% confidence interval will have a margin of error of3. a) 73 O = 20 nニ 2g 2= 1.282 b. ア4 ez C. 9 d. 1チ1 (1.28)"(20) 73 e. nニ125

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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37. The sample mean lifetime of electronic components produced by a certain method was 125 hours. Assume that component lifetimes are normally distributed with population standard deviation o= 20 hours. Find the sample size needed so that an 80% confidence interval will have a margin of error of 3. O = 20 nニ 2g? 2= 1.282 a) 73 6. ア4 c. 9 d. 1チ1 (1.288) (205 EL = e. 8 nこ125
Transcribed Image Text:37. The sample mean lifetime of electronic components produced by a certain method was 125 hours. Assume that component lifetimes are normally distributed with population standard deviation o= 20 hours. Find the sample size needed so that an 80% confidence interval will have a margin of error of 3. O = 20 nニ 2g? 2= 1.282 a) 73 6. ア4 c. 9 d. 1チ1 (1.288) (205 EL = e. 8 nこ125
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