1. x = mother’s body mass index

y = daughter’s body mass index

2. x = amount of the artificial sweetener saccharin in a rat’s diet

y = count of tumors in the rat’s bladder

3. x = a student’s SAT score as a high school senior

y = a student’s first-year college grade point average

4. x = monthly flow of money into stock mutual funds

y = monthly rate of return for the stock market

5. x = whether a person regularly attends religious services

y = how long the person lives

6. x = the number of years of education a worker has

y = the worker’s income