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 = 21 248 262 256 251 244 276 240 265 257 252 282 256 250 264 270 275 245 275 253 265 272 Weights (in lb) of pro basketball players: x2; n2 = 19 204 200 220 210 193 215 221 216 228 207 225 208 195 191 207 196 183 193 201 (a) Use a calculator with mean and standard deviation keys to calculate x1, s1, x2, and s2. (Round your answers to one decimal place.) x1 =   s1 =   x2 =   s2 =   (b) Let μ1 be the population mean for x1 and let μ2 be the population mean for x2. Find a 99% confidence interval for μ1 − μ2. (Round your answers to one decimal place.) lower limit       upper limit

Question

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: x1n1 = 21
248 262 256 251 244 276 240 265 257 252 282
256 250 264 270 275 245 275 253 265 272
Weights (in lb) of pro basketball players: x2n2 = 19
204 200 220 210 193 215 221 216 228 207
225 208 195 191 207 196 183 193 201
(a) Use a calculator with mean and standard deviation keys to calculate x1s1, x2, and s2. (Round your answers to one decimal place.)
x1 =  
s1 =  
x2 =  
s2 =  

(b) Let μ1 be the population mean for x1 and let μ2 be the population mean for x2. Find a 99% confidence interval for μ1 − μ2. (Round your answers to one decimal place.)
lower limit      
upper limit      

 

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