Suppose that we will randomly select a sample of 146 measurements from a population having a mean equal to 24 and a standard deviation equal to 6.
(a) 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? Fill in the blank.
_______(Normally distributed or Not Normally Distributed)
______(Yes or No), because the sample size is _______(large or small).
(b) Find the mean and the standard deviation of the sampling distribution of the sample mean. (Round your σx̄ answer to 1 decimal place.)
(c) Calculate the probability that we will obtain a sample mean greater than 25; that is, calculate P( > 25). Hint: Find the z value corresponding to 25 by using µ and σ because we wish to calculate a probability about x̄. (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.)
(d) Calculate the probability that we will obtain a sample mean less than 23.157; that is, calculate P( < 23.157) (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.)