All persons running for public office must report the amounts of money spent during their campaigns. Political scientists have contended that female candidates generally find it difficult to raise money and therefore spend less in their campaigns than do male candidates. Suppose the ­accompanying data represent the campaign expenditures of a randomly selected group of 20 male and 20 female candidates for the state legislature. Do the data support the claim that female candidates generally spend less in their campaigns for public office than do male candidates?
Campaign Expenditures (in thousands of dollars)

a. Estimate the size of the difference in the mean campaign expenditures between female and male candidates using a 95% confidence interval.
b. Is there a significant difference at the .05 level in the mean campaign expenditures between female and male candidates?
c. Is there a practical difference in the mean campaign expenditures between female and male candidates?
d. Are the conditions necessary to analyze the data using the t test to satisfied?

Candidate 2 3 4 5 678 9 10 12 13 14 15 16 17 18 19 20 Female 169 206 257 294 252 283 240 207 230 183 298 269 256 277 300 126 318 184 252 305 Male 289 334 278 268 336 438 388 388 394 394 425 386 356 342 305 365 355 312 209 458