Amelia used a random sample of 100 accounts receivable to estimate the relationship between Days (number of days from billing to receipt of payment) and Size (size of balance due in dollars). Her estimated regression equation was Days = 22 + 0.0047 Size with a correlation coefficient of .300. From this information we can conclude that:

The hypothesis test for the slope will have 99 degrees of freedom

the relationship between Days and Size must not be significant because the coefficient of Size is so small

9 percent of the variation in Days is explained by Size

Larger accounts usually take less time to pay