Q .1

Question 1 9 pts 9 1 0 Details A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 61 students who averaged 29.1 texts per day. The standard deviation was 14.1 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval, which distribution should you use? O z-distribution Ot-distribution b. With 90% confidence the population mean number of texts per day is between and texts. c. If many groups of 61 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population number of texts per day and about percent will not contain the true population mean number of texts per day. d. To the best of your ability, explain how you found the values in the confidence interval in part B. You may want to tell me which formula you used, what you plugged in to the formula, etc. Partial credit may be awarded for any parts in this explanation that are correct even if your final answer was incorrect