Suppose a 90% confidence interval for the mean salary of collegegraduates in a town in Mississippi is given by [$45,783, $57,017].The population standard deviation used for the analysis is known tobe $13,700. [You may find it useful to reference the z table.]
a. What is the point estimate of the mean salary for all collegegraduates in this town?
b. Determine the sample size used for the analysis. (Round \"z\"value to 3 decimal places and final answer to the nearest wholenumber.)
