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# Unit 12: Significance tests (hypothesis testing)

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## About this unit

Significance tests give us a formal process for using sample data to evaluate the likelihood of some claim about a population value. Learn how to conduct significance tests and calculate p-values to see how likely a sample result is to occur by random chance. You'll also see how we use p-values to make conclusions about hypotheses.### Learn

### Practice

- Simple hypothesis testingGet 3 of 4 questions to level up!
- Writing null and alternative hypothesesGet 3 of 4 questions to level up!
- Estimating P-values from simulationsGet 3 of 4 questions to level up!

### Learn

### Practice

- Type I vs Type II errorGet 3 of 4 questions to level up!
- Error probabilities and powerGet 3 of 4 questions to level up!

### Learn

### Practice

- Writing hypotheses for a test about a proportionGet 3 of 4 questions to level up!
- Conditions for a z test about a proportionGet 3 of 4 questions to level up!
- Calculating the test statistic in a z test for a proportionGet 3 of 4 questions to level up!
- Calculating the P-value in a z test for a proportionGet 3 of 4 questions to level up!
- Making conclusions in a z test for a proportionGet 3 of 4 questions to level up!

### Learn

### Practice

- Writing hypotheses for a test about a meanGet 3 of 4 questions to level up!
- Conditions for a t test about a meanGet 3 of 4 questions to level up!
- Calculating the test statistic in a t test for a meanGet 3 of 4 questions to level up!
- Calculating the P-value in a t test for a meanGet 3 of 4 questions to level up!
- Making conclusions in a t test for a meanGet 3 of 4 questions to level up!

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