30 A manufacturer of refrigerators claims that his product possess an average de

Question

30 A manufacturer of refrigerators claims that his product possess an average defect-free ite of 30 monsths Snurdhopper has heard complaints about this product and therefore feels that t the manufacturer is somewhat high. In a sample of 100 refrigerators.esve 28 837 month. Historical data indicates the opinion that the average life was smaller than the manufacturers claim at o Dr the average defect-free life claimed by standard deviation was 5.0 monns. Dr. Snurdhopper decided to test his rage ide untl repairs were needed Test Statistic X28.837-30 -2.326 o) Decision Rule: ifp-value ( 01)

Explanation / Answer

30) Test statistic is z = - 2.326

P-value = P(Z < - 2.326) = 0.0100

P-value and level of significane both are same so we fail to reject null hypothesis.

31) Correct option is a)

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