Final answer:
To compare the mean number of hours worked by sex using an independent sample test, you would need two independent samples, one for each sex. The test statistic used is the t-test.
Step-by-step explanation:
To conduct an independent sample test to compare the mean number of hours worked by sex, you would need two independent samples, one for each sex. The null hypothesis (H0) would state that there is no significant difference in the mean number of hours worked between the two sexes. The alternative hypothesis (Ha) would state that there is a significant difference. The test statistic used to compare means is the t-test. You would calculate the test statistic and compare it to the critical value from the t-distribution to determine if the difference is statistically significant.