Answer to Question #223374 in Statistics and Probability for Koketso

Question

Upon leaving an assembly area, production items are examined and some of them are found to be in need of their further work or total scrapping. Tags on a sample of 150 items that failed final inspection show both the recommended action and the identity of the inspector who examined the item. The summary information for the sample is given below:


Recommended action Inspector A Inspector B Inspector C



Major Rework 20 14 13

Minor Rework 18 16 23

Scrap 16 21 9


NB: α = 5%.


Which of the following statements is incorrect?


A.Test statistic is 7.35

B. Critical value is 9.488

C.We fail to reject H₀ at 5% significance level..

D.Degrees of freedom is 9.

E. H₀: the recommended actions is independent of inspectors.

H₁: the recommended actions is not independent of inspectors