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In: Statistics and Probability

A statistics professor is at a supermarket waiting in line to buy some groceries. While waiting...

A statistics professor is at a supermarket waiting in line to buy some groceries. While waiting for the line to move he listened to several people complaining about the long delays. From the different conversions going on he quickly gathers some inform and estimates from the large sample that the mean waiting time is about 12 minutes. He then estimates the population standard deviation to be 1.5 minutes.
1. (a) Explain in detail using full sentences how he should go about finding a 90% confidence interval for the time he has to wait in line to be served. Enumerate each step.
2. Let’s assume that from the question in part (1) it is determined that its margin of error is approximately 3.5. minutes. (a) What does this mean exactly for a 90% confidence interval?

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orchestra answered 2 years ago
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