PSCP S2 Practice Exam #5

A correlation cannot have the value

• 0.4

• -0.75

• 1.5

• 0.0

• 0.99

Which correlation indicates a strong positive straight line relationship?

• 0.4

• -0.75

• 1.5

• 0.0

• 0.99

Tags

CCSS.HSS.ID.B.5

If the least squares regression line for predicting y from x is y = 500 - 20x, what is the predicted value of y when x = 10?

• 300

• 500

• 200

• 700

• 20

To display the relationship between per capita wine consumption and heart disease death rates per 100,000 people, in each of 29 countries, a good choice of a graph would be a

• angiogram

• boxplot

• histogram

• line graph

• scatterplot

Which of these statements is true of the correlation r?

• (a) r always takes values 0 or greater than 0.

• (b) r always takes values between -1 and 1.

• (c) r describes only straight line relationships.

• (d) Both (a) and (c).

• (e) Both (b) and (c).

Tags

CCSS.HSS.ID.C.8

The least-squares regression line for x = SAT and y = GPA is:

• y = 137.0x

• y = 239.4 + 137.0x

• y = 137.0 + 239.4x

• y = –0.103 + 0.005x

• y = 0.005 – 0.103x

Tags

CCSS.HSS.ID.C.8

The correlation coefficient r between GPA and SAT is:

• -0.32

• 1.2

• 0.68

• 0.83

• 1

Tags

CCSS.HSS.ID.C.8

Suppose we wanted to predict the future GPA of a sixth incoming student who has an SAT score of 788. Our best prediction on the basis of the given data would be

• 3.70

• 3.72

• 3.75

• 3.79

• 3.84

The equation of the least-squares regression line of crime (y) on enrollment (x) is

• y = 21.8x – 112.6

• y = –112.6x + 21.8

• y = 112.6x – 21.8

• y = 0.04x + 7.0

• y = 7.0x + 0.04

Tags

CCSS.HSS.ID.C.8

If the point (26, 601) were removed from the data, how would the slope of the regression line change?

• The slope of the new line would be steeper than the original line.

• The slope of the new line would be less steep than the original line.

• The slope would change from positive to negative.

• The slope would change from negative to positive.

• The slope would remain the same.

Tags

CCSS.8.EE.B.5