Question

Save & Exit Practice Lesson: 11.2a Describe hypothesis testing ... DEBRA HEIER Question 2 of 5. Step 1 of 1 1/5 Correct Ince 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 5.7 pounds/square Inch. It is believed that the valve performs above the specifications. The valve was tested on 100 engines and the mean pressure was 5.9 pounds/square inch. Assume the standard deviation is known to be 0.7. A level of significance of 0.01 will be used. Find the value of the test statistic. Round your answer to 2 decimal places Enter the value of the test statistic Answer How to enter your answer - Tables Keypad Keyboard Shortcuts

Answer 1

Here We have Sample Size (n) = 100 Sample mean (X) = 5.9 Standard deviation () = 0.7 Hypothesis Ho : 4 = 5.7 Ha : u> 5.7 Test statistics Z II x- x-u Vn = 5.9-5.7 0.7 100 = 2.86 Thanks.