ndependent 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 football players: x1; n1 = 21 248 263 254 251 244 276 240 265 257 252 282 256 250 264 270 275 245 275 253 265 272 Weights (in lb) of pro basketball players: x2; n2 = 19 203 200 220 210 193 215 223 216 228 207 225 208 195 191 207 196 181 193 201

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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 football players: x1; n1 = 21
248 263 254 251 244 276 240 265 257 252 282
256 250 264 270 275 245 275 253 265 272
Weights (in lb) of pro basketball players: x2; n2 = 19
203 200 220 210 193 215 223 216 228 207
225 208 195 191 207 196 181 193 201
 
(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 99% confidence interval for ?1 − ?2. (Round your answers to one decimal place.)
lower limit      
upper limit      

 

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