The article “Workaholism in Organizations: Gender Differences” (Sex Roles [1999]: 333–346) gave the following data on 1996 income (in Canadian dollars) for random samples of male and female MBA graduates from a particular Canadian business school:

a. For what significance levels would you conclude that the mean salary of female MBA graduates of this business school is above $100,000?

b. Is there convincing evidence that the mean salary for female MBA graduates of this business school is lower than the mean salary for the male graduates?

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Males Females n 258 233 X $133,442 $105,156 S $131,090 $98,525