Question 4 of 8 Step 1 of 1 07:47:54 An engineer designed a valve that will regu

Question

Question 4 of 8 Step 1 of 1 07:47:54 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 5.8 pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on 26 engines and the mean pressure was 6.1 pounds/square inch with a standard deviation of 0.9. A level of significance of 0.05 will be used. Assume the population distribution is approximately normal. Make the decision to reject or fail to reject the null hypothesis. Answer 2 Points Keypad Reject Null Hypothesis Fail to Reject Null Hypothesis 17 Hawkes Learning

Explanation / Answer

Result : fail to reject null hypothesis

since

H0 : u = 5.8

H1 : u > 5.8

Decision rule :If p value < 0.05, then reject H0

T statistic = 6.1 - 5.8/ [0.9/sqrt(26)] = 1.7

Here p value = 0.0508 > 0.05

So fail to reject null hypothesis

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