Residual Calculations

How do you calculate a residual?

• Observed - Predicted

• Predicted - Observed

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

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

• YES

• NO

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

• YES

• NO

The regression equation y = 25x + 100 models the cost, y, of an event for x people. The table shows what the party sizes actually paid. Complete the table with the predicted values and residuals.

e

f

g

h

d

c

underestimate

-35

overestimate

35

225

300

15

-15