Consider the sample regressions for the linear, the logarithm ic, the exponential, and the log-log models. For each o f the estimated models, predict y when x equals 50.

Response V a ria b le : y R espo nse V a ria b le : ln (y )

M o d e l 1 M o d e l 2 M o d e l 3 M o d e l 4 In te rc e p t 18.52 − 6 .7 4 1.48 1.02 x 1.68 NA 0 .0 6 NA ln (x ) NA 2 9 .9 6 NA 0 .9 6 Se 23.92 19.71 0.12 0.10