Tutorial Exercise Assume that the population proportion is 0 70 Compute the standard error of the proportion for sample sizes of 100 200 500 and 1 000 What can you say about the size of the standard error of the proportion as the sample size is increased Step 1 The standard error of a proportion is used to describe the standard deviation of a sample proportion p Recall the calculation for the standard error sample of size n from the population P p 1 n p op of a population proportion p for a Since n is included in the computation for the standard error the standard error will change depending on the sample size for a given population proportion Here the population proportion is given to be 0 70 so p