An engineer has designed a value that will regulate water pressure on an automobile engine. The value was tested on 170 engines and the mean pressure was 5.2 pounds/square inch(psi) Assume the population standard deviation is 0.9. If the value was designed to produce a mean pressure of 5.3psi, is there sufficient evidence at the 0.1 level that the value performs below the specification?

1. state the null and alternative hypotheses.

Ho: ____________ Ha:___________

2. Find the value of the test statistic (2 decimal places)

3. specify if the test is one-tailed or two-tailed.

choose one (1. one tailed test 2. two-tailed test)

4. Find the p-value of the test statistic (4 decimal places)

5. identify the level of significance for the hypothesis test.

6. Make the decision to reject or fail to reject the null hypothesis

choose one ( 1. Reject null hypothesis 2. Fail to reject null hypothesis)