Location is known to affect the number, of a particular item, sold by an automobile dealer. Two different locations, A and B, are selected on an experimental basis. Location A was observed for 9 days and location B was observed for 13 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 9 and location B sold 51 of these items with a sample standard deviation of 6. Select a 95% confidence interval for the difference in the true means of items sold at location A and B.

a)[-19.16, -4.84]

b)[44.34, 57.66]

c)[83.34, 96.66]

d)[-15.18, -8.815]

e)[32.34, 45.66]

f)None of the above