Question

for the 150 cars on the lot of a used - car dealership, explain why you would expect a positive relationship, negative relationship, or no relationship between the pairs of variables in parts a through e.
a. consider the age of the car and the number of oil changes. what would one expect to be the relationship between the variables?
a. no relationship because the number of oil changes is not correlated with the age of the car
b. positive relationship because the number of oil changes decreases as the age of the car increases
c. positive relationship because the number of oil changes increases as the age of the car increases
d. negative relationship because the number of oil changes increases as the age of the car increases

Explanation:

As a car gets older, more time has passed during which oil - changes are typically needed. So, the number of oil - changes is likely to increase with the age of the car. A positive relationship means that as one variable (age of the car) increases, the other variable (number of oil - changes) also increases.

Answer:

C. Positive relationship because the number of oil changes increases as the age of the car increases