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 Ib) of pro...

Extracted text: 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 Ib) of pro football players: x,; n, = 21 243 261 255 251 244 276 240 265 257 252 282 256 250 264 270 275 245 275 253 265 272 Weights (in Ib) of pro basketball players: x2; n, = 19 202 200 220 210 191 215 223 216 228 207 225 208 195 191 207 196 181 193 201 In USE SALT (a) Use a calculator with mean and standard deviation keys to calculate x,, s,, X2, and s,. (Round your answers to four decimal places.) X1 S, = X2 = S, = (b) Let u, be the population mean for x, and let u, be the population mean for x,. Find a 99% confidence interval for u, - µ2. (Round your answers to one decimal place.) lower limit upper limit