Question

In a random sample of 81 items taken from a large consignment some were found to be defective. If the standard error of the proportion of defective items in the sample is 1/18, find 90% and 95% confidence limits of the percentage of defective items in the consignment.​

Answer 1

Step-by-step explanation:

let the number of defectives are 40.

let p denote the proportion of defective

then p = 40/81 = 0.49

q = 1-p = 1-0.49 = 0.51