Question

For each of the following situations, state the predictor variable and the outcome variable.

a. A study is done to determine if elderly drivers are involved in more motor vehicle fatalities than other drivers. The number of fatalities per 100,000 drivers is compared to the age of drivers.
b. A study is done to determine if the weekly grocery bill changes based on the number of family members.

Answer 1

Part a

Predictor variable - age of drivers

Outcome variable - number of fatalities caused by elderly drivers out of total 100,000 drivers

Part b

Predictor variable - Number of family members

Outcome variable - weekly grocery bill

Explanation:

Part a)

Predictor variable is basically independent variable whose influence is studied on the dependent variable or the outcome variable

Predictor variable - age of drivers

Outcome variable - number of fatalities caused by elderly drivers out of total 100,000 drivers

Part b

Predictor variable - Number of family members

Outcome variable - weekly grocery bill