A Coffee Shop Franchise Owner Is Looking at Two Possible

Multiple Choice

A coffee shop franchise owner is looking at two possible locations for a new shop.To help make a decision he looks at the number of pedestrians that go by each of the two locations in one-hour segments.At location A,counts are taken for 35 one-hour units and with a mean number of pedestrians of 421 and a sample standard deviation of 122.At the second location (B) ,counts are taken for 50 one hour units with a mean number of pedestrians of 347 and a sample standard deviation of 85.Assume the two populations variances are not known but are equal.Calculate a 95% confidence interval for the difference in pedestrian traffic at the two locations.(pooled estimate of = 22.4)

A) (37.15 110.85)
B) (14.6 59.4)
C) (51.6 96.4)
D) (30.1 117.9)