AP Stats Chapters

• This residual graph represents a linear fit.
• This graph represents a nonlinear fit.
• This residual graph represents no fit.

• This residual plot represents a linear fit.
• This residual plot represents a nonlinear fit.
• This residual plot represents no fit.

In a scatterplot r is called

• Coefficient of Determination

• Correlation coefficient

• Regression Line

• Slope

Determine the Correlation Coefficient and decide whether it is weak, moderate, or strong.

• -0.19 weak

• -0.19 moderate

• 0.04 weak

• 0.04 strong

When calculating the linear model (which is the equation for the Line of Best Fit for a set of quantitative data) our goal is to...

• Minimize the residuals

• Maximize the residuals

• Ignore the residuals

• What are residuals?

I predicted someone would score a 78% on their test, but they actually scored an 81%. What's the residual?

• 81 - 78 = 3

• 78 - 81 = -3

• What's residual?

_____________________ is the use of a regression line for prediction outside the interval of x values used to obtain the line.

The ___________________ measures the percent of the variability in the response variable that is accounted for by the least-squares regression line.

• coefficient of determination

• coefficient of relaxation

Which of the following definitions are true...

• Points with high leverage in regression have much larger or much smaller x values than the other points in the data set.

• An outlier in regression is a point that does not follow the pattern of the data and has a large residual.

• An influential point in regression is any point that, if removed, substantially changes the slope, y intercept, correlation, coefficient of determination, or standard deviation of the residuals.

• All of the above

What type of correlation exists between the number of people that go to the pool and the temperature outside.

• positive

• negative

• no correlation

• unknown