A large family-held department store had the business objective of imprOVIng between when the complaint was made and when it was resolved. Data were collected from 40 complaints that were made in the las (a) through (d) below. E Click the icon to view the data table. ..... a. Construct a 95% confidence interval estimate for the population mean number of days between the receipt of a complaint and th The 95% confidence interval estimate is from 28.8 days to 51.8 days. (Round to one decimal place as needed.) b. What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)? OA The number of complaints per day is normally distributed. O B. The number of complaints per day follows the t distribution. C. The number of days to resolve complaints is normally distributed. O D. The number of days to resolve complaints follows thet distribution. c. Do you think that the assumption needed in order to construct the confidence interval estimate in (a) is valid? Explain. O A. No, the data suggest the population distribution is skewed to the left. O B. Yes, the data suggest the population distribution approximately follows the t distribution. O C. No, the data suggest the population distribution is skewed to the right. O D. Yes, the data suggest the population distribution is approximately normal. Days Between Complaint and Resolution of Complaint 37 103 43 26 90 8 17 26 29 8 152 43 48 25 29 13 118 68 18 48 16 25 119 63 13 22 56 10 99 24 22 11 47 21 19 48 35