Final answer:
The strength and sign of the relationship between variables can be determined through correlation analysis.
Step-by-step explanation:
The strength and sign of the relationship between each pair of variables can be determined through correlation analysis. Correlation measures the degree to which two variables are related and the direction of their relationship. In the case of used car price and original sale price of the car, we would expect a positive relationship because as the original sale price increases, the used car price is likely to increase. Similarly, for used car price and number of cup holders in the car, there may be a weak or no relationship, as the number of cup holders is unlikely to have a significant impact on the price of a used car. For used car price and number of oil changes the car has had, it is difficult to predict the direction of the relationship without additional context. Finally, for used car price and number of miles the car has been driven, we would expect a negative relationship. Generally, as the number of miles driven increases, the used car price tends to decrease.