Question

Suppose you are interested in buying a new Toyota Corolla. You are standing on the sales lot looking at a model with different options. The list price is on the vehicle. As a salesperson approaches, you wonder what the dealer invoice price is for this model with its options. The following data are based on a random selection of Toyota Corollas of different models and options. Let y be the dealer invoice (in thousands of dollars) for the given vehicle. (a) Verify that Σχ . 79.7, ΣΥ . 72.2. D,2 . 1050.29, Σ-#870.18, ΣΧγ -960.36, and r 0.877 6877 (b) Use a 1% level of significance to test the claim that p> 0, (Use 2 decimal places.) O Reject the null hypothesis, there is sufficient evidence that p > 0. o Reject the null hypothesis, there is insufficient evidence that ρ > o Fail to reject the null hypothesis, there is insufficient evidence that p> 0 O Fail to reject the null hypothesis, there is sufficient evidence that p 0. (c) Verify that Se0.2816, a 1.269, and b 0.810. (d) Find the predicted dealer invoice when the list price is x (thousand dollars). (Use 2 decimal places.) 13.7 (e) Find a 99% confidence interval for y when x dollars). (Use 2 decimal places.) 13.7 (thousand (f) Use a 1% level of significance to test the claim that ß > 0, (use 2 decimal places.)

Answer 1

NE 12-37 991. congdence interu/ad forY (4:684-0 7816 1 12, 3チ 11:07 < ー1ー 13-67