(Solved): Question 4 (i) The inspection results for Dell laptops shows that the total number defective in a sa ...

Question 4 (i) The inspection results for Dell laptops shows that the total number defective in a sample of 25 subgroups of 300 each is 138. The inspector inspected a total of 7 500 laptops. Determine the trial control limits. (10) (ii) A household and car insurance company wishes to determine the proportion of car insurance claims that are incorrectly filled out (nonconforming). Based some preliminary data, he estimates the percent nonconforming as 20% (p = 0.20). He desires a precision of 10% and a confidence level of 90%. Determine the sample size. (5) [15]