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on 9 (10 marks) ducing Defective Items An engineer wishes to see whether a machine's new part will help reduce the number of defective items Flag produced by a manufacturing process. The data are shown below: Instruction estion Machine 1 2 3 456 Number of Defectives with the Old Part 12 9 0 5 4 3 Questions Number of Defectives with the New Part 9 61 323 YOU DO NOT NEED TO CHECK THE MODEL CONDITIONS. Final Steps a. Find a 90% confidence interval for the mean number of defective items produced with the new part. (4 marks) b. Using a = 0.05, can it be concluded that the number of defective items has been reduced after using the new part? State the hypotheses, give the test statistic value, the p-value, and state your conclusion. (4 marks) c. Describe the types I and Il errors in the context of this problem. (2 marks) E B