Question

The lifetime of a certain type of battery is known to be normally distributed with a...

The lifetime of a certain type of battery is known to be normally distributed with a population standard deviation of 20 hours. A sample of 50 batteries had a mean lifetime of 120.1 hours.

a. What is the point estimate?

b. Calculate the sampling error.

c. Construct a 95% confidence interval for the population mean. Explain the answer in a sentence.

Math   Statistics-And-Probability   
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Answer #1

Confidence interval calculation.

Here Z confidence interval calculation because population standard deviation is known.

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