Correlation Quiz

Email *

What does a strong positive correlation mean? *

• As the x value increases, the y value also increases.

• As the x value increases, the y values decrease.

• As the x values increase, the y values must be more than the x values.

• You cannot answer unless you know the correlation coefficient.

Which of the following has a stronger correlation than r = -0.54? *

• r = 0

• r = 0.45

• r = -0.45

• r = -0.74

Look at the scatterplot. Which model would best describe the display?

• linear

• quadratic

• exponential

Which of the following best illustrates a set of data with no correlation?

• A

• B

• C

• D

The regression line above was computed to show the Percent of Games Won by Year for the Northside Eagles. Using the regression line, predict the winning percentage for 1996.

• 48%

• 46%

• 30%

• impossible to tell

Put the data in your calculator (L1 and L2). What is the line of best fit (y = mx + b)?

• y = -0.66x + 2.25

• y = 2.25x - 0.66

• y = 0.99x - 2.25

• y = 0.66x + 0.99

Using the same data from the last question, what is the correlation coefficient (r)?

• -0.66

• 2.25

• 0.99

• -0.99

Using the correlation coefficient found in the last question, how would this data be correlated?

• strong positive

• weak positive

• strong negative

• weak negative

• no correlation

Put the data in your calculator (L1 and L2). What is the line of best fit (y = mx + b)? Round to the nearest hundredth (2 decimal places).