Independent random samples of professional football and basketball players gave the following information.Heights (in ft) of pro football players: x₁; n₁ = 45

6.31	6.51	6.50	6.25	6.50	6.33	6.25	6.17	6.42	6.33
6.42	6.58	6.08	6.58	6.50	6.42	6.25	6.67	5.91	6.00
5.83	6.00	5.83	5.08	6.75	5.83	6.17	5.75	6.00	5.75
6.50	5.83	5.91	5.67	6.00	6.08	6.17	6.58	6.50	6.25
6.33	5.25	6.65	6.50	5.81

Heights (in ft) of pro basketball players: x₂; n₂ = 40

6.08	6.58	6.25	6.58	6.25	5.92	7.00	6.41	6.75	6.25
6.00	6.92	6.83	6.58	6.41	6.67	6.67	5.75	6.25	6.25
6.50	6.00	6.92	6.25	6.42	6.58	6.58	6.08	6.75	6.50
6.83	6.08	6.92	6.00	6.33	6.50	6.58	6.83	6.50	6.58

(a) Use a calculator with mean and standard deviation keys to calculate x₁, s₁, x₂, and s₂. (Round your answers to four decimal places.)

x1 =
s1 =
x2 =
s2 =

(b) Let ₁ be the population mean for x₁ and let ₂ be the population mean for x₂. Find a 90% confidence interval for ₁ - ₂. (Round your answers to three decimal places.)

Upper Limit=

Lower Limit=