Hypothesis testing. Suppose we are interested in determining whether or not there is a difference in child care hours by gender.

Analysis Source 55 Between groups 4142.08688 within groups 653047.833 Total 657189.92 Bartlett's equalvariances test: of variance df 4 794 798 ch12(4} MS 1035.52172 822.478379 823.546266 10.7739 Prob>ch12 0.029 gender Obs Rank sum Expected 312 96779. 5 124800 2 487 222820.5 194800 Combined 799 319600 319600 Unadjusted variance 10129600 Adjustment for ties -28131.833 Adjusted variance 10101468 HO: child_~e(gender==1) = child_~e(gender==2) Z = -8.816 Prob > |z| = 0. 0000 Exact prob = 0. 0000