Chapter 4, Problem 4CR

StatisticalLiteracy Suppose that for x = 3. the predicted value is y = 6.

The data pair (3. 8) is part of the sample data. What is the value of the residual for x = 3?

In Problems 9-14,

(a) Draw a scatter diagram for the data.

(b) Find $\bar{x},\bar{y},b$. and the equations of the least-squares line. Plot the line on the scatter diagram of part (a).

(c) Find the sample correlation coefficient r and the coefficient of determination $r^2$. What percentage of variation in y is explained by the least-squares model?