Sampling & Distributions

Interactive Tutorial • Practice Problems • Speed Quiz

What is a Distribution? 📊

  A **distribution** shows how often different values of a variable occur in a dataset. The most common type is the **normal distribution**, often called the "bell curve." [Image of a bell curve]

  The bell curve is symmetrical, with most of the data clustered around the middle (the mean). Examples of normally distributed data include human height, test scores, or blood pressure readings.

 
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Video: Sampling in Action 🎬

Watch this video to visualize how samples relate to a population.

 
 
 

Practice Problems

Choose the best sampling method or distribution type for each scenario.

 
   
1) A new drug's effectiveness.
   

What kind of distribution would you expect for patient outcomes?

       
   
 
 
   
2) A school wants to survey student opinions on lunch.
   

They pick 50 students from each grade. What is this?

       
   
 
 
   
3) You ask your friends about their favorite video game.
   

What type of sampling is this?

       
   
 
 
   
4) The results of rolling a fair die 10,000 times.
   

Which distribution would this be?

       
   
 

⚡ Sampling Speed Quiz

       
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