In exercise 20, data on x price ($) and y overall score for ten 42-inch plasma televisions tested by Consumer Reports provided the estimated regression equation yˆ 12.0169

.0127x. For these data SSE 540.04 and SST 982.40. Use the F test to determine whether the price for a 42-inch plasma television and the overall score are related at the

.05 level of significance.

c. Use equation (14.26) to estimate the standard deviation of an individual value of y when x 4.

d. Use expression (14.27) to develop a 95% prediction interval for y when x 4.