Question

Would you expect the regression line for the average number of cigarettes smoked per day vs. the rate of lung cancer to slope up or down, or would it be pretty much horizontal?

A. down
B. horizontal
C. up

Would you expect the regression line for the price of a camera vs. the number sold to slope up or down, or would it be pretty much horizontal?

A. up
B. down
C. horizontal

In the left column below are listed the r-values of various data sets, each of which contains 100 points. Descriptions of those data sets are shown in the right column. Match each r-value with the description of the data set with which it is most likely associated.

	r=0.1		A.	Data shows a clear upward trend
	r=0.6		B.	Data points lie quite close to a line with negative slope
	r=0.9		C.	Data shows a very slight upward trend
	r=−0.6		D.	Data shows a clear downward trend
	r=−0.9		E.	Data points lie quite close to a line with positive slope

Answer 1

1)

Since we know average number of cigarettes smoked per day will increase the chances of lung cancer.

C. up

2)
Since we know that decrease in the price of a camera will increase the. the number sold

B. down

3)

r=0.1	C.	Data shows a very slight upward trend
r=0.6	E.	Data points lie quite close to a line with positive slope
r=0.9	A.	Data shows a clear upward trend
r=−0.6	B.	Data points lie quite close to a line with negative slope
r=−0.9	D.	Data shows a clear downward trend

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