Hypothesis testing is one of the most confusing and frustrating areas of mathematics. Here are some terms you need to know:

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### Sample

A portion of the population that you gather information from. A good sample is one that represents the population accurately.

### Census

A census is when you gather information from the entire population.

### Survey

A survey is the act of gathering information from a sample.

### Parameter

A parameter is a characteristic of the population, such as the number of people with brown hair.

### Statistic

A statistic is a characteristic calculated from a sample, such as the number of brown haired people within a sample.