Question

Question 2 of 4 Step 1 of 5 00:55:26 An engineer designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such that it would produce a mean pressure of 4.2 pounds/square inch. The valve was tested on 270 engines and the mean pressure was 43 pounds/square inch. Assume the variance is known to be 0.49. Is there evidence at the 0.1 level that the valve performs above the specifications? Step 1 of 5: Enter the hypotheses: Answer 2 Points Keypad vkes Learning search

Answer 1

Solution from given data M= 4.2 pounds Isquare sach n = 270 À = 4.3 pounds / square Joch Variance is?): 0-49 savona $20.7 d:0.10 stept of 5! Enter the hypothesis The hypothesis is given by from right-tailed test Haim 39.2.9 Step 2 of 58 Test statistic (2): -M alon 54.3-4.2 0.7/1276 0.0.426 Test statistic (7) . 2:3494 m step 3 of 5 e specify of the test is one-halled or two-tailed Test: one failed tesla

step u of 58 Decision Rule. Z> 1. 2816 2.3474 > 1.2816 > Resuch Hoa step sol sa Conclusion: Resect will hypothesis. ... conclude that the valive is so there a sufficient Evidence to performing below specifications in