## 2.9 Unit 2 summary

### 2.9.1 You should be able to

Conduct a statistical hypothesis test of an observed result, including:

- Write an appropriate null hypothesis that specifies a “no effect” probability model and a source of variation
- Use Monte Carlo simulation in TinkerPlots™ to simulate a study if the null hypothesis were true
- Model: Use a sampler to model the study if the null hypothesis were true
- Simulate: Run the simulation hundreds of times and collect the result of interest.
- Evaluate:
- Find a range of likely results if the null hypothesis were true
- Determine whether the observed result is compatible with the null hypothesis

- Formulate a conclusion

### 2.9.2 You should understand

The logic behind statistical hypothesis testing, including:

- The role of the null hypothesis as specifying a baseline to compare the observed result to
- Why we use Monte Carlo simulation
- What the distribution of results represents
- What we are checking for, in order to determine whether the observed result is compatible with the null model
- The sort of conclusions we can (and can’t) make from a statistical hypothesis test.

### 2.9.3 TinkerPlots™ skills

- Create a new sampler and use different devices to model a null hypothesis
- Plot values from a table and organize (by separating) the the plotted values.
- Numerically summarize values in a plot (e.g.,
`Count (N)`

,`Count (%)`

). - Automatically collect the results from many trials.
- Find the mean and SD of a distribution
- Use the Divider tool to select a range of values.

### 2.9.4 Vocab

- Null hypothesis
- “No effect” probability model