(Solved): please answer both John wishes to estimate the population standard deviation of salary of colle ...

John wishes to estimate the population standard deviation of salary of college graduates who took a statistics course in college. How many college graduates must he survey? Assume that he wants to be the sample standard deviation to be within $5\%$ of the population standard deviation and to be $99\%$ confident of that statement. Question 13 $4\mathrm{pts}$ Assume that you want to test the claim that the paired sample data come from a population for which the mean difference is ${?}_d=0$. Compute the absolute value of the test statistic. (Round your answer to nearest hundredth. Hint: The correct test statistic is positive.)