Analysis of recent data from a sample of men and women showed that younger people were far more likely to support the #MeToo movement than older people.

Table 13.20 shows the relationship between age and support for #MeToo, controlling for gender. Support for #MeToo is measured on a 100-point scale, with 0 indicating no support and 100 indicating total support.

a. A two-sample test for mean differences shows a statistically significant difference between the younger and older groups among men, but not among women. What kind of variable is gender?

b. Draw a figure that represents the relationship among the three variables shown in Table 13.20.