Chapter 4.2, Problem 4.48E

(a)

To determine

To explain that should we use the regression equation from application $4.2$ why or why not.

Explanation of Solution

We can use the regression model from before because $80$ degrees is within the range of temperatures used to create the regression model.

(b)

To determine

To explain that regression, slope of the least squares line and the y -intercept affect if we change the temperature data in application $4.2$ from Fahrenheit to Celsius.

Explanation of Solution

The correlation would not change because the relationship between the values and regression model does not change. The slope would only change by the value needed to convert Fahrenheit to Celsius, as would the y -intercept.