ALT-CAT 9.1 Hypothesis Testing for Population Mean i (known sigma) A report states that adults 18- to 24- years old send and receive 1 28 texts every day. In order to test this claim, we take a sample of n = 30 individuals where we find the sample mean to be 1 18 20 texts per day (= 118.20). Assume a population standard deviation of 33.1 7 texts per day (o = 33.17). a. Set up the null hypothesis (I.) and the alternative hypothesis ( I_) - interpret each in terms of the business application. b. At the 95% confidence level, test whether the average number of texts per day is different than the one claimed in the report. What is the p-value of the test? Show all steps and calculations. c. How do you interpret the results from part b