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## z tests for percentages
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This test can be used if:
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- The data is a simple random sample from the population of interest
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- The sample size is large
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- A qualitative variable of interest summarized by percentages
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- Can use a box with tickets of 1s and zeros to represent the population
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If an observed value is too many SEs away from the expected value, it is hard to explain by chance.
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### Null Hypotheses
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A statement about a parameter, a statement of equality. The chance of getting an *x* is *y*%.
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An alternative hypothesis, or a research hypotheses, is what the researcher is out to prove. A statement of inequality (<, >, $\ne$).
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| Term | Description |
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| ---- | ---- |
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| Null Hypothesis | This is a statement about a *parameter* |
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| Alternative/Research Hypothesis | |
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| One-tailed test | Use when the alternative hypothesis says that the % of 1s is less than or greater than expected. It's one sided |
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## c tests for averages
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