Independent random samples of professional football and basketball players gave the following information. Assume that the weight distributions are mound-shaped and symmetric. Weights (in lb) of pro...

(a) Use a calculator with mean and standard deviation keys to calculate x₁,s
₁, x₂, ands
₂. (Round your answers to one decimal place.)

x1 =
s 1 =
x2 =
s 2 =

(b) Let μ₁ be the population mean forx
₁ and let μ₂ be the population mean forx
₂. Find a 99% confidence interval for μ₁ − μ₂. (Round your answers to one decimal place.)

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