Asked by Rebecca

The mean television viewing time for Americans is 15 hours per week. Suppose a sample of 60 Americans is taken to further investigate viewing habits. Assume the population standard deviation for weekly viewing ime is o = 4 hours.

A What is the probability the sample mean will be within 1 hour of the population mean?

B. What is the probability the sample mean will be within 45 minutes of the population mean?
Answered by PsyDAG
You need to convert the hours to a Z score and then look up the probabilities in the back of your statistics textbook in an appendix labeled something like "areas under the normal distribution."

Z = (X - ƒÊ)/SD, where X = raw score, ƒÊ = mean and SD = standard deviation.

A involves X of 14 to 16, while B involves X of 14.25 to 15.75, converting minutes to portions of an hour.

You should be able to solve it with this information. I hope it helps. Thanks for asking.
Answered by Rebecca
Just wanted to say thank you for your help. It is greatly appreciated.
Answered by Anonymous
kjjn
Answered by Anonymous
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Answered by Anonymous
NO IDEA PLZ HELP ME
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