Xr13-134 In designing advertising campaigns to sell magazines, it is important to know how much time each of several demographic groups spends reading magazines. In a preliminary study, 40 people were randomly selected. Each was asked how much time per week he or she spends reading magazines; in addition, each was categorized by both gender and income level (high or low). The data are stored in the following way: column 1  time spent reading magazines per week in minutes for all respondents;

column 2  gender (1  male, 2  female); column 3  income level (1  low, 2  high).

a. Is there sufficient evidence at the 10% significance level to conclude that men and women differ in the amount of time spent reading magazines?

b. Is there sufficient evidence at the 10% significance level to conclude that high-income individuals devote more time to reading magazines than low-income people?