Answer Happy

Suppose that we will randomly select a sample of 79 measurements from a population having a mean equal to 21 and a standard deviation equal to 8. (e) Describe the shape of the sampling distribution of the sample mean Do we need to make any assumptions about the shape of the population? Why or why not? because the sample size is (b) Find the mean and the standard deviation of the sampling distribution of the sample mean (Round your answer to 1 decimal place.) 95
LIX ax (c) Calculate the probability that we will obtain a sample mean greater than 23, that is, calculate P>23) Hint: Find the zvalue corresponding to 23 by using u; and o, because we wish to calculate a probability about. (Use the rounded standard error to compute the rounded Z-score used to find the probability. Round your answer to 4 decimal places. Round z-scores to 2 decimal places.) PX>23) (d) Calculate the probability that we will obtain a sample mean less than 20.487; that is, calculate P <20.487) (Use the rounded standard error to compute the rounded Z-score used to find the probability. Round your answer to 4 decimal places. Round z- scores to 2 decimal places.) PGX<20 487)