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1. A sampling distribution of the mean has a mean  μ  X̄ =45 μ  X̄ =45 and a standard...

1. A sampling distribution of the mean has a mean  μ  X̄ =45 μ  X̄ =45 and a standard error  σ  X̄ =7 σ  X̄ =7 based on a random sample of n=15.n=15.

a. What is the population mean?

b. What is the population standard deviation?

Round to two decimal places if necessary

2. If it is appropriate to do so, use the normal approximation to the  p^  p^ -distribution to calculate the indicated probability:

Standard Normal Distribution Table

n=80,p=0.715n=80,p=0.715

P( p̂  > 0.75)P( p̂  > 0.75) =

Enter 0 if it is not appropriate to do so.

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