B2. Within SPSS, it is possible to introduce a third categorical variable into a Crosstabs analysis, to see if the relationship between two variables is consistent for different levels of a third variable. In this exercise, run the same analysis that you ran in Exercise B1, except this time enter the variable poverty as the “Layer” variable in the third slot of the opening dialog box. This will run the crosstab and chi-square analysis between bmicat and hlthlimt separately for women who were below poverty and those who were not. Then answer the following questions:

(a) Among normal-weight women who were below poverty, what is the expected frequency of having a health limitation? How many actually did have a limitation? What are the two values for normal-weight women who were above poverty?

(b) What percent of women below poverty and above poverty had a health condition that limited their ability to work?

(c) What were the values of the chi-square statistic in the below poverty and above poverty subgroups?

(d) Were both statistics statistically significant for a .05? At what level?

(e) What were the values of Cramér’s V for the below poverty and above poverty groups?

(f) Comment on these values of V in relation to power in these analyses.