Average Earnings for College Graduates The average earnings of year-round full-time workers with bachelor's degrees or more is dollar 88,641 for men and dollar 58,000 for women - a difference of slightly over dollar 30,000 a year. One hundred of each were randomly sampled, resulting in a sample mean of dollar 90,200 for men, and the population standard deviation is dollar 15,000 ; and a mean of dollar 57,800 for women, and the population standard deviation is dollar 12,800. At the 0.01 level of significance, can it be concluded that the difference in means is not dollar 30,000 ?

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