For each of the following descriptions, state whether you think there is a relationship between the two variables and if either of them might have a causative effect on the other.
Annual crop yield and annual rainfall in a given area.
Temperature of an object measured in degrees Fahrenheit and temperature measured in degrees Celsius.
The number of students entering Michigan State University in a given year and the year of entry.
State expenditures on teachers' salaries and high school graduation rates.