A study of admission rates of men and women into graduate programs for several majors at a certain university was conducted. The study found that overall a higher percentage of men were admitted than women. However, when looking at each major program separately it was found that the rate of admission for women was higher than that for men. Which of the following statements is true? Check all that apply. a. This is an example of Simpson’s paradox. b. This is an example of a negative association between variables. c. Type of major" may be a lurking variable in this study. d. This situation is mathematically impossible.