Acme Sound produces components for car stereos. The average life of these components is designed to be at least 5,000 hours.
Janet M., the quality control officer of this company, has selected a random sample of 12 components and traced the life (in hours) between installation and failure. The following data were obtained:
4,973
5,138
4,805
5,494
5,259
5,198
5,722
4,894
5,738
4,222
5,849
5,200
At the 0.05 significance level, can Janet conclude that the life of their components is different from 5,000 hours?
a. State the Null and Alternate Hypotheses:
Ho: M (Click to select) * Hp. M (Click to select) $
(2,2)
(2,2)
What is the direction of the test? (2)
(Click to select) #)
State the decision rule: (4,4)
(Note: IF your answer to question (b) above is 2-T, provide the answer using the positive side of the tails. The Final answer should be in 3 decimal places and IF your answer is a negative number, it must include the negative sign.)
Reject Ho when the test statistics is (Click to select) *