Lifetime of electronics: In a simple random sample of 100 electronic components produced by a certain method, the mean lifetime was 125 hours. Assume that component lifetimes are normally distributed with population standard deviation o = hours. Round the critical value to no less than three decimal places. 20 %3D Part 1 of 2 (a) Construct a 90% confidence interval for the mean battery life. Round the answer to the nearest whole number. A 90% confidence interval for the mean battery life is 122 < u < 128 Part: 1/ 2 Part 2 of 2 (b) Find the sample size needed so that a 99.5% confidence interval will have a margin of error of 4. A sample size of is needed so that a 99.5% confidence interval will have a margin of error of 4. Round the sample size up to the nearest integer. Submit Assignment 2020 McGraw-Hill Education. All Rights Reserved. Terms of Use Privacy earch

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