Question

A researcher in a small Midwestern town wants to estimate the mean weekday sleep time of its adult residents. He takes a random sample of 80 adult residents and records their weekday mean sleep time as 6.4 hours. Assume that the population standard deviation is fairly stable at 1.8 hours. (You may find it useful to reference the z table.)

a. Calculate the 95% confidence interval for the population mean weekday sleep time of all adult residents of this Midwestern town.

Answer 1

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explanation :

Answer 2

Answer:

• Yes, the confidence interval contains the value 7
• Yes, the confidence interval does not contain the value 7
• No, since the confidence interval contains the value 7
• No, since the confidence interval does not contain the value 7

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