SOL A.9 Review

What kind of correlation?

• Positive
• Negative
• No

What kind of correlation?

• Positive
• Negative
• No

Which type of regression model does the scatter plot appear to show?

• linear

• exponential

• quadratic

Which scatter plot shows no relationship?

• Graph A
• Graph B
• Graph C
• Graph D

Determine the curve of best fit. Hint: view the scatter plot and check correlation coefficients to determine which is the best fit.

• y = -2.7x + 7.4

• y = 0.95x² - 2.08x - 0.75

• y = -.05x - 3.26

• y = 0.95x² + 2.08x + 0.75

Find the quadratic equation for the relationship of the horizontal distance and the height of the ball.

• y= -18x² + 2.11x + 4.21

• y= -.06x² +1.06x + 7.9

• y= -6x² +1.06x + 79

• y= -.12x² + 2.11x + 4.22

Write the linear regression equation for the following data points. Round to the nearest hundredth.

A restaurant sells pizza for the prices in the data table.  Calculate the linear regression equation of the data.

• y = 1.5x + 12
• y = 12x + 1.5
• y = 0.67x - 8
• y = -8x + 0.67

The table shows the height of a tree for various years after it was planted. Using the line of best fit, how tall would the tree be 30 years after it was planted?

• 22 feet

• 23 feet

• 36 feet

• 37 feet

Calculate the Curve of Best Fit for this table of values:

• y = 2x² - 9x + 10

• y = 3x² + 9x - 10

• y = 3.1x² - 9.2x - 10.3

• y = 2.1x² - 8.6x + 10.1