Lines of Best, Correlation Coefficients and Residuals

What is a scatter plot?

• A graph that shows the relationship of two data sets.
• A graph drawn using rectangular bars to show how large each value is.
• A graph that shows information that is connected in some way.
• A graph that shows data changing over time.

Describe the correlation, if the correlation coefficient is r = -0.26

• Positive, weak

• Negative, weak

• Positive, strong

• Negative, strong

Describe the correlation:

r = -0.98

• Strong positive

• Weak positive

• Strong negative

• Weak negative

How do you calculate a residual?

• Observed values - Predicted values

• Predicted values - Observed values

Shown is a residual plot. Would a linear regression model of the data be most appropriate?

• YES
• NO

A scatter plot and residual plot are the same thing.

• True
• False

• 617.51 km

• 621.09 km

• 100 km

• 0.19 km

A study conducted to determine if one can predict the yield of a crop based on the amount of fertilizer applied to the soil. The dependent variable in this study is ...

• yield of the crop

• the experimeter

• amount of fertilizer applied to the soil

• the soil

In a scatter plot what does the x axis (horizontal) of the graph represent?

• Response Variable

• Explanatory Variable

• The X Values of the function

After performing analyses on a set of data, Mrs. Schoeneck examined the scatter plot of the residual values for each analysis. Which scatter plot indicated the best linear fit for the data?

• A
• B
• C