Use the standard error to construct a approximate prediction interval for Yusing an alpha of 5%. (Round your answer to 2 decimal places.) Prediction interval for Y: ŷ± Based on the width of this prediction interval, would you say the predictions are good enough to have practical value? Yes O No

Use the linear approximation to estimate (3.02)2(3.03)2=? compare with the value given by a calculator and compute percentage error. Error = ?%

For a football game in the National Football League, let y = difference between the number of points scored by the home team and the away team (so y > 0 if the home team wins). Let x bet the predicted difference according to the Las Vegas betting spread. For the 768 NFL games played between 2003 and 2006, output follows. Predictor Coefficient SE Coef T P Constant -0.4022 0.5233 -0.77 0.442 BP 1.0251 0.0824 12.44 0.000 (a) We wish to test the null hypothesis that the Las Vegas predictions are unbiased. This will correspond with ? = 0 and ? = b) Based on the results shown in the table, is there much evidence that the sample fit differs from the model ?y = ? + ?x, with values of alpha and beta above? Why?

Answer for the following question (B). (B) Use the prediction line to predict the final exam score of a student that use 15 hours to study for the final exam. The predicted score is__________ points