Linear Functions, Regression Review

What is the correlation coefficient, r, for the scatterplot?

• r = -.95

• r = -.43

• r = . 70

• r = - .76

• r = .51

What is the correlation coefficient, r, of the scatterplot?

• r = 0.37

• r = - 0.28

• r = 0.64

• r = -.81

What is the correlation coefficient, r, of the scatterplot?

• r = 0.88

• r = -0.52

• r = -0.94

• r = 0.43

1. If x and y vary inversely and x = 7 when y = 4 , then what is y when x = 10?

• 28

• 5.7

• 2.8

• 17.5

The time it takes a group of students to paint a classroom varies inversely with the number of students. If 3 students can paint the room in 8 hours, then how long with it take 4 students to paint the same room?

• 2 hours

• 2 and 2/3 hours

• 4 hours

• 6 hours

A line goes through the points (-3,7), (6,4), and (12,p). What is the value of p?

• p = 1

• p = 2

• p = -3

• p = 0

Write the equation of a line that goes through the points (-5,8) and (15,16).

• y = 2/5x + 10

• y = -5/2x + 8

• y = 4/5x + 8

• y = -2/5x + 10

What is the slope of a line that goes through the points (-7,-6) and (-14,-3)?

• 3/7

• 7/3

• -3/7

• -7/3

At a summer camp, the total cost of the camp varies jointly as the number of participants and the length of the retreat. If a 3-day camp with 24 participants costs $720, what is the cost for a 7-day retreat with 30 participants?

• $6300

• $900

• $2100

• $1680

Determine the equation of the variation model.

• f(x) = .8x + 2

• f(x) = -.8x + 4

• f(x) = 1.25x + 2

• f(x) = -1.25x