Question

During ts manufacture, a product is slected to four different fests in order. Anoticiency expert claims that the fourth and fittis urnecessary since its is can be predicted based on the first three tests. To test this claim, multiple regression will be used to model Test score), as a function Test scoren Test 2 score vald Tests.com NoteAll test scores ange from 200 to 100, with higher scores indicative of a higher quality product Consider the model EV). 2. f3 The first onder model was fit to the data for each of 12 urits sampled from the production in the results we summarized in the printout. SOURCE DF SS MS F VALUE PROB> 15 16 MODEL ERROR TOTAL 3 8 12 151617 22331 173645 0.872 ROOT MSE 52.72 R-SQUARE DEP MEAN 6458 ADJR SO 0.824 VARIABLE PARAMETER ESTIMATE STANDARD ERROR TFORO PARAMETER-O PROBITI INTERCEPT 80.50 0.15 XITESTI 0245 0.1111 20 0.009 XATEST 0.056 380 0005 X555 0.3265 OSOS 400 0 0 Suppose the 95% confidence interval for 3 is (15. 47). Which of the following statements is incorrect? We are 95% confident that the Test3 is a useful liner predictor of Test score, holding Testi and Test2 fed We are 95% confident that the estimated slope for the Test-Test3 line fails between 15 and 47 holding Test and Test2 foed At = .05, there is insufficient evidence to reject Ho Do in favor of a P30 We are 95% confident that the increase in Test score for every 1 point increase in Test score falls between 15 and 47 holding Test and Test2 fixed

Answer 1