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Statistics · AP · Sampling Distributions

CED focus

The Normal Distribution, Revisited

This topic is assessed on the AP Exam.

Multiple-choice tips

  • Separate parameter vs statistic in the stem.
  • Eliminate choices that confuse sample data with sampling distribution.
  • Check Normal/Large Counts conditions on MC.
  • Recognize when CLT applies to means or proportions.

Free-response tips

  • Name the parameter being estimated or tested.
  • State independence and sample size conditions.
  • Describe center, spread, and shape of a sampling distribution.
  • Connect sample size to standard error in words.

Common traps

  • Confusing p with p̂ or μ with x̄
  • Using Normal model without checking conditions
  • Treating one sample histogram as the sampling distribution

Quick checklist

  • [ ] Can distinguish parameter and statistic
  • [ ] Can state conditions for a Normal model
  • [ ] Can describe how sample size affects variability

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