We build a confidence interval for a proportion when we want to estimate what percent of a population fits some category. For example, what percent of voters support a certain candidate? Instead of polling everyone, we can take a sample and make an estimate using a confidence interval.
4 Question Sets
Calculating a z interval for a proportion
Multiple Choice (12)
12 Questions
Conditions for a z interval for a proportion
Checkboxes (12)
12 Questions
Finding the critical value z* for a desired confidence level
Multiple Choice (13)
13 Questions
Sample size and margin of error in a z interval for p
Multiple Choice (9)
9 Questions