What is the strongest relationship you can infer between two variables from this statement?

The number of minutes you can talk on a cell phone decreases as the phone's battery charge decreases.

causation

correlation

association

no relationship

The correct answer is:

Causation.

Explanation:

As the battery charge of a phone decreases, the amount of time you can perform any action with the phone decreases, including the number of minutes you can talk. This is because after a certain amount of time, there will be no more battery charge, which means you will not be able to use the phone at all.

Correlation, due that talking on the phone is not a cause of the battery decrease (assuming that the phone call does not consume battery given that the phone is already discharging).

Correlation