55. To compare the population mean annual incomes for Hispanics (#41) and for whites (u) having jobs in construction, we construct a 95% confidence interval for -Mj.

a) If the confidence interval is (3000, 6000). then at this confidence level we conclude that the inean income for whites is higher than for Hispanics.

b) If the confidence interval is (-1000. 3000). then the corresponding a = .05 level test of Ho. against Hautejects Ha.

c) If the confidence interval is (-1000, 3000). Then it is plausible that =

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