In which of the following cases is a proportion of the observations of a sample used in estimating the confidence interval?
A) when the degrees of freedom are too large
B) when a true sampling distribution cannot be estimated
C) when the population standard deviation is known
D) when variables have only two possible outcomes

Question

Quizplus · Accepted Answer

When variables have only two possible outcomes (e.g., success/failure, yes/no), a proportion of the observations of a sample is used in estimating the confidence interval, typically applying the binomial distribution or its normal approximation for large samples.

In Which of the Following Cases Is a Proportion of the Observations