A survey of 9 statistics professors was undertaken. Each professor was asked how much time was devoted to preparing the lectures. The times (in hours) are normally distributed. 11 21 18 19 35 9 15 27 29 Answer the following 2 questions: (Round your answers to 2 decimal places) (a). Determine a 94.5% confidence interval estimate of the population mean preparation time. (b). What is the point estimate of the population mean preparation time? O (a) (14.04, 26.85), (b) 20.55 O (a) (13.04, 26.85), (b) 20.44 (a) (14.04, 27.85), (b) 20.44 (a) (14.04, 26.85), (b) 20.44 O (a) (14.14, 26.85), (b) 20.44 ONone of the options