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)

Question

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)

Quizplus · Accepted Answer

[74 F1F1F1S1F1F1F10 (1.96)22.4)] = [74 F1F1F1S1F1F1F10 43.9] = [30.1,117.9]

A Coffee Shop Franchise Owner Is Looking at Two Possible