Jake has found a correlation between the amount of time he spends exercising every day and the number of hours he sleeps at night. The more he exercises, the longer he sleeps. However, his psychology instructor explained to him that correlation does not mean causation. This means that .

This means that by itself, the correlation doesn't say if more exercise causes longer sleep.

Explanation:

Jake has found a correlation in between the sleeping hours at night and the number of the time one spends on the exercising. He observe that longer he he spend exercising the more hours he spend in sleeping in night, however there is no scientific evidence that is explained by his psychology instructor that there is no cause and effect mean to this correlation.

Thus, the correct answer is : by itself, the correlation doesn't say if more exercise causes longer sleep.

hmmm

true, i think.

i checked and it seems the answer is, true.

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.