Use the information given in question 66 to find an estimate of the mean number of defective parts, using an unbiased estimation procedure. Also find a 99 % confidence interval for this value.

Question 66

A company that operates three different types of factories is interested in the number of defective products produced. The following table gives the results of a sampling study done on the number of defective parts:

(a) Find an estimate of the total number of defective parts, using an unbiased estimation procedure.

(b) Find a 95 % confidence interval for this total.

Transcribed Image Text:

Number of defective parts in factories of Type 1 75 10 12.3 4.7 N ni Si Type 2 90 15 11.5 7.5 Type 3 100 20 16.4 3.4