Chapter 11. I have some questions about chapter 11. How to think for MC11-12 and MC11-15?
MC11-12. Think in terms of: (a) Population is usually larger than 5000. See Table 14-8, no effect here. (b) (+direct relationship) + (-Inverse relationship) = offsetting effect. (c) (-Inverse relationship) – (+direct relationship) = magnifying effect. (d) (-Inverse) – (-Inverse) = offsetting effect. Therefore, the answer is (c) which has the greatest effect. MC11-15. Think in terms of: From Table 11-5 an increase in the sample size will always lead to a decrease in the CUDR if the new sample exception rate (SER) = exception found/ the increased sample size, does no change. For example, from Table 11-5, if originally the actual number of exception found is 3, and sample size is 100, the CUDR is 7.6 and the SER is 3/100 = 3%. Now if sample size increases by 50 to 150, the CUDR is now 5.1 (decrease from 7.6) if the new exception found in the increased sample of 50 does not change, that is, if the new exception found is 1.5 which gives the new SER the same 3% =1.5/50.
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