Chapter 6 Algebra

Estimate the correlation coefficient.

• r = -0.8

• r = -0.5

• r = 0.5

• r = 0.8

If the least squares regression line for a data set is y = -1 + 4x , what is the predicted value of y when x = 7?

• The predicted value of y when x = 7 is 27.

• The predicted value of y when x = 7 is 31.

• The predicted value of y when x = 7 is 15.

• The predicted value of y when x = 7 is 20.

Using the information provided in the picture, What is the equation of the LSRL?

• y = -126.43x + 0.59

• y = 0.94x - 126.43

• y = 0.59x + 126.43

• y = 0.59x - 126.43

Using the information in the picture, What is the slope of the LSRL?

• 0.59

• -126.43

• 0.89

• 0.94

Using the information provided in the picture, What is the strength of the relation?

• Strong

• Moderate

• Weak

Solve:
y = 2x -11
-3y = -6x -15

• (-1.5,-4)

• (1.5,4)

• No solution (parallel lines)

• Infinitely many solutions

• A
• B
• C
• D

Select the correct graph for each inequality.

• A

• B

• C

• D

Which system of inequalities is shown?

• y ≥ -x - 1
  y < x + 4

• y < -x - 1
   y ≥ x + 4

• y > -x - 1
  y ≥ x + 4

• y > -x - 1
  y ≥ x + 3