Finding Confidence Intervals for Proportions: Formula & Example


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question 1 of 3

In the formula for the confidence interval, why do we add and subtract z * s_p-hat from p-hat?

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1. What do p and p-hat denote, respectively?

2. What is the margin of error?

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About This Quiz & Worksheet

Practice finding confidence intervals with this combination quiz and worksheet. You will be asked about population proportions and sample proportions, as well as how to find a margin of error.

Quiz & Worksheet Goals

Inside, you will be asked about the following:

  • The formula for margin of error
  • Expressing population and sample proportions
  • The definition of margin of error
  • Point estimates

Skills Practiced

  • Defining key concepts - be sure that you can accurately describe the margin of error in words
  • Information recall - remember what you have learned about the mathematical formula for margin of error
  • Knowledge application - use your knowledge to answer questions about population and sample proportions

Additional Learning

To find out more, visit the lesson titled Finding Confidence Intervals for Proportions: Formula & Example. This lesson will teach you about the following topics:

  • Large samples
  • Utilizing formulas
  • Distribution curves
  • Examples of populations