In 2000, the population mean hourly wage for males was $22 for white-collar jobs, $11 for service jobs, and $14 for blue-collar jobs. For females the means were $15 for white-collar jobs, $8 for service jobs, and $10 for blue-collar jobs.3
a. Identify the response variable and the two factors.
b. Show these means in a two-way classification of the two factors.
c. Compare the differences between males and females for
(i) White-collar jobs and
(ii) Blue-collar jobs.
Explain why there is interaction, and describe it.
d. Show a set of six population mean incomes that would satisfy H0: no interaction.