Lifetime of electronics: In a simple random sample of 100 electronic components produced by a certain method, the mean l

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Lifetime Of Electronics In A Simple Random Sample Of 100 Electronic Components Produced By A Certain Method The Mean L 1 (41.3 KiB) Viewed 20 times

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 - 20 hours, Round the critical value to no less than three decimal places. Part 1 of 2 (a) Construct a 99% confidence interval for the mean battery life. Round the answer to the nearest whole number. A 99% confidence interval for the mean battery life is 778 546 Correct Answer: 120 μ<130 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 3. A sample size of is needed so that a 99.5% confidence interval will have a margin of error of 3. Round the sample size up to the nearest integer. X ⊙ 乌 3 20