Question 1

When additional patrol cars are placed on duty, what happens to the average speed of cars on that stretch of highway?

	the average speed increases
	the average speed decreases
	the average speed doesn't change at all
	the average speed would be 72.2 mph

Question 2

A regression equation was computed to be Y= 35 + 6x. The value of the 35 indicates that...

	the regression line crosses the Y-axis at 35
	the correlation coefficient is 35
	an increase of one unit in X will result in an increase of 35 in Y
	the coefficient determination is 35

Question 3

Which of the following statements isnot correct regarding the correlation coefficient?

	It can range from -1 to 1.
	Its square, i.e. R-squared, is the coefficient of determination.
	It measures the percent of variation explained.
	It is difficult to interpret.

Question 4

The coefficient of determination...

	is usually written as r.
	cannot be negative.
	is the square of the coefficient of correlation.
	all of the above
	none of the above

Question 5

If the coefficient of determination is 0.81, what percentage of variation isnot explained?

	19%
	90%
	81%
	none of the above