7.69 Teacher Salaries. Data on salaries in the public school sys- tem are published annually in Ranking of the States and Estimates of School Statistics by the National Education Association. The mean annual salary of (public) classroom teachers is $55.4 thousand. As- sume a standard deviation of $9.2 thousand. Do the following tasks for the variable “annual salary" of classroom teachers. a. Determine the sampling distribution of the sample mean for sam- ples of size 64. Interpret your answer in terms of the distribution of all possible sample mean salaries for samples of 64 classroom teachers. b. Repeat part (a) for samples of size 256. c. Do you need to assume that classroom teacher salaries are normally distributed to answer parts (a) and (b)? Explain your answer.

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