## Inferential Statistics...

**Probability:** The probability of the results of a study happening by chance and a one off. Its measured using the P Value. The smaller the P value the more reliable the results. A P value of P less than 0.05 is the normal value psychologists use, this means there is 5% chance of it being chance.

**Significant:** If your test is significant then you can reject your null hypothesis.

**Levels of Measurement:**

**Nominal:** The data is put into catergories for example sorting people by height, tall, medium, short...

**Ordinal:** Data is ordered in some way e.g alphabetically...

**Interval:** Data is measured in units of equal interval such as counting correct answers...

**Type 1 Error:** Rejecting the null hypothesis when you shouldn't,P value is too high...

**Type 2 Error:** Accepting the null hypothesis when you shouldn't, P value is too low...

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