From d4b99194ccf8dc14d0f9b37502b649393bc2ff93 Mon Sep 17 00:00:00 2001 From: zleyyij Date: Fri, 2 Feb 2024 12:42:57 -0700 Subject: [PATCH] vault backup: 2024-02-02 12:42:57 --- education/statistics/Hypothesis Tests.md | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/education/statistics/Hypothesis Tests.md b/education/statistics/Hypothesis Tests.md index 16d9389..5298159 100644 --- a/education/statistics/Hypothesis Tests.md +++ b/education/statistics/Hypothesis Tests.md @@ -6,14 +6,16 @@ This test can be used if: - A qualitative variable of interest summarized by percentages - Can use a box with tickets of 1s and zeros to represent the population If an observed value is too many SEs away from the expected value, it is hard to explain by chance. -### Null Hypotheses + | Term | Description | | ---- | ---- | -| Null Hypothesis | This is a statement about a *parameter*. It's a statement about equality. The chance of getting *x* is *y%*. | +| Null Hypothesis | This is a statement about a *parameter*. It's a statement about equality. The chance of getting *x* is *y%*. A null hypothesis isn't proven true, you either prove it wrong (reject it), or don't (fail to reject). | | Alternative/Research Hypothesis | What the researcher is out to prove, a statement of inequality. (Less than, greater than, not equal to). | -| One-tailed test | Use when the alternative hypothesis says that the % of 1s is *less than* or *greater than* expected. It's one sided. | -| Two tailed test | When something is not equal to the expected. | - +| One-tailed test | Use when the alternative hypothesis says that the % of 1s is *less than* or *greater than* expected. It's one sided, because the area of importance on a distribution only has one side, and extends all the way outwards, away from the normal curve. | +| Two tailed test | Use when something is *not equal* to the expected. It's called a two tailed test because the area of significance has two sides | +## z tests for averages +This test will look very similar to a z test for percentages + You ## P Value The chance of observing at least a sample statistic, or something more extreme, if the null hypothesis is true. If the p-value is less than *5*%, reject the null hypothesis.