Location is known to affect the number, of a particular item, sold by an auto parts facility. Two different locations, A and B, are selected on an experimental basis. Location A was observed for 13 days and location B was observed for 18 days. The number of the particular items sold per day was recorded for each location. On average, location A sold 39 of these items with a sample standard deviation of 8 and location B sold 55 of these items with a sample standard deviation of 2. Select a 90% confidence interval for the difference in the true means of items sold at location A and B. a) [-17.95, -14.05]
b) [-19.85, -12.15]
c) [35.78, 42.22]
d) [90.78, 97.22]
e) [51.78, 58.22]
f) none of the above