Solutions Statistics

Using the data, with y = average dollar sales per call, x1 = years of experience, and x2 = score on

Question: Using the data, with y = average dollar sales per call, x1 = years of experience, and x2 = score on the sales aptitude test; fit a second-order model with interaction to the data. Interpret the R² value for the model and indicate whether, at the 0.05 level, the model is significant.

Avg. $/call	Yrs	Score	Yrs_sq	Score_sq	*YrsScore**
184.82	1	25.5	1	650.25	25.5
358.88	4	41.2	16	1697.44	164.8
468.53	9	65.2	81	4251.04	586.8
287.02	2	37.0	4	1369.00	74.0
319.27	3	34.1	9	1162.81	102.3
593.22	14	87.3	196	7621.29	1222.2
305.38	2	30.0	4	900.00	60.0
211.28	1	35.4	1	1253.16	35.4
515.23	11	82.6	121	6822.76	908.6
478.21	8	66.6	64	4435.56	532.8
479.45	11	62.3	121	3881.29	685.3
522.63	12	90.3	144	8154.09	1083.6
492.32	10	60.3	100	3636.09	603.0
460.70	6	67.4	36	4542.76	404.4
515.48	10	74.9	100	5610.01	749.0
487.25	12	79.2	144	6272.64	950.4
491.55	11	85.8	121	7361.64	943.8
553.66	13	89.5	169	8010.25	1163.5
395.61	5	47.7	25	2275.29	238.5
422.78	5	59.7	25	3564.09	298.5