If the coefficient of determination for a data set containing 9 points is 1, how many of the data points must lie on the regression line for the data set.

9 points

Step-by-step explanation:

The coefficient of determination is a number between 0 and 1 used to measure the level of precision with which the regression model  created fits the data. A measure of   means that the model explains the entire variation between the two variables without error.

Therefore, in this case if means that the 9 points are on the line

1. sometimes

2. never true

3. sometimes

step-by-step explanation:

these are pretty self explanatory if you know what supp right and com angles are