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3.3 Random Sampling and Data Collection

Part of Collecting Data in AP® Statistics. Read the opening section, then create a free account for the full interactive lesson, practice, and progress tracking.

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Simple Random Sample (SRS)

A simple random sample (SRS)

How to select an SRS:

  1. Assign a unique number to each individual in the population
  2. Use a random number table or calculator to select n{n} numbers
  3. The individuals with those numbers form the sample

Properties of SRS:

  • Every individual has an equal chance of selection
  • Every possible sample of size n{n} has an equal chance
  • No bias in selection
  • Results are representative (on average)

Example: To sample 50 students from a school of 800, assign numbers 001-800 and use a random number generator.

Random number table

In this unit

7 lessons

  1. 3.1Introducing Statistics: Do the Data We Collected Tell the Truth?Preview lesson
  2. 3.2Introduction to Planning a StudyPreview lesson
  3. 3.3Random Sampling and Data CollectionThis lesson
  4. 3.4Potential Problems with SamplingPreview lesson
  5. 3.5Introduction to Experimental DesignPreview lesson
  6. 3.6Selecting an Experimental DesignPreview lesson
  7. 3.7Inference and ExperimentsPreview lesson

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