10.117 Multiple choice: Comparing mean incomes A study compares the population mean annual incomes for Hispanics 1m12 and for whites 1m22 having jobs in construction, using a 95% confidence interval for m1 - m2.

Choose the best correct choice.

a. If the confidence interval is 1 -6000, -30002, then at this confidence level we conclude that the mean income for whites is less than for Hispanics.

b. If the confidence interval is 1 -3000, 10002, then the test of H0: m1 = m2 against Ha: m1 • m2 with significance level 0.05 rejects H0.

c. If the confidence interval is 1 -3000, 10002, then we can conclude that m1 = m2.

d. If the confidence interval is 1 -3000, 10002, then we are 95% confident that the population mean annual income for Hispanics is between 3000 less and 1000 more than the population mean annual income for whites.