Question

- Save & Edt Certify Lesson: 11.2a Testing a Hypothesis about ... CAVAN SCALE Question 2 of 12, Step 1 of 1 1/12 Correct 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 6.0 pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on 240 engines and the mean pressure was 6.1 pounds/square inch. Assume the standard deviation is known to be 0.8. A level of significance of 0.05 will be used. Determine the decision rule. Enter the decision rule. Tables Keypad Answer How to enter your answer Reject H. Submit Answer © 2020 Hawkes Learning MacBook Air

Answer 1

Given that:

Mu = 6

Sigma= 0.8

Alpha=0.05

To test hypothesis:

H0: Mu= 6 Vs H1: Mu > 6

The given test right tail test

Decision Rule: Reject H0 if Zcal > Zcrit at alpha=0.05

From z table, Zcrit= Z(0.05)= 1.645

Hence Decision Rule is

Reject H0 if Zcal>1.645 at alpha=0.05