Exercise 1: You are interested in determining the average number of social media accounts people have. You interview 30 people at random and the number of social media accounts they have has a sample mean of 7.1 and a sample standard deviation of 2.09. a) [1 point] Define the parameter of interest. 1)) [3 points] State and check if the assumptions needed for constructing the appropriate CI for the parameter of interest are satised. c) [3 points] Find a 90% confidence interval for the parameter defined in part a). Use the table, not the calculator to find the appropriate critical value. d) [2 points] Write a sentence to interpret the CI computed in part c)