A sample of 100 fuses from a very large shipment is found to have 10 that are defective. Based on this information, which of the following will you construct to learn about the proportion of fuses that are defective?
A) confidence interval estimate for the proportion using the standard normal distribution
B) confidence interval estimate for the total using the Student's t distribution
C) confidence interval estimate for the difference using the standard normal distribution
D) confidence interval estimate for the mean using the Student's t distribution

Question

Quizplus · Accepted Answer

We are interested in learning about the proportion of defective fuses in the entire shipment. Therefore, we would construct an inference interval for the population proportion using the standard normal distribution. Choice B and D are not appropriate because we do not have information about the total or the mean. Choice C is not appropriate because we are not comparing the proportion of defective fuses in two different groups.

A Sample of 100 Fuses from a Very Large Shipment