A Coffee Shop Franchise Owner Is Looking at Two Possible $\neq$

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.Setup the null hypothesis to test the claim that both sites have the same number of pedestrians.

A) µ_a - µ_b = 0
B) µ_a - µ_b $\neq$ 0
C) µ_a - µ_b > 0
D) µ_a - µ_b < 0