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AP Statistics 3.5.B Writing One-Proportion Hypotheses

Practise writing null and alternative hypotheses for a population proportion by using the parameter, placing equality in the null, and matching a more-than claim.

Syllabus
Effective Fall 2026
Course
AP Statistics

Exam points

  • Write the null hypothesis with equality at the stated benchmark population proportion.
  • Use the population parameter p rather than the sample statistic p-hat in the hypotheses.
  • Translate a more-than research claim into a right-tailed alternative hypothesis.

3.5.B—Identify the null and alternative hypotheses for a population proportion question 1

[Maximum number: 1]

Researchers want to study whether a capuchin monkey named Rafiki can correctly predict (better than guesswork) whether the Dow Jones Industrial Average (DJIA) will go up or down on any given day. In a random sample of 10 days, Rafiki correctly predicted the rise or fall of the DJIA on 7 of the 10 days. (He did this by choosing to eat a banana from either a box with an "up" arrow or a box with a "down" arrow.)

Identify the null and alternative hypotheses.

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