# Solution to "Statistics - Confidence Interval" question

A random sample of 200 bolts from machine A contained 14 defective bolts, while an independently chosen, random sample of 325 bolts from machine B contained 35 defective bolts. Let P1 be the proportion of the population of all bolts from machine A that are defective, and let P2 be the proportion of the population of all bolts from machine B that are defective. Find a 95% confidence interval for P1-P2 . Then complete the table below.

1. What is the lower limit of the 95% confidence interval?

2. What is the upper limit of the 95% confidence interval?

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