Refer to Exercise 14.129. A similar study was conducted for Bachelor’s degrees.

a. Can we infer from the data that incomes differed for 25- to 34-year-olds with Bachelor’s degrees between the three periods?

b. Are the required conditions satisfied? Explain.

In exercise 14.129

How have 25- to 34-year-olds with university degrees fared financially since 1984? To answer this question, the Pew Research Center conducted surveys in 1984, 1996, and 2009 recording monthly earnings for graduates with three different types of degrees. The incomes were converted into 2012 dollars.