## ← Gettysburg or Wilma - Intro to Inferential Statistics

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Showing Revision 5 created 05/25/2016 by Udacity Robot.

1. If these are our critical regions with the probability in each region, .025 to
2. make a total alpha level of .05. And remember this is the t distribution. And
3. this t value here is negative 2.042. And this t value is positive 2.042. 2.58
4. falls above 2.042. And if we had gone the opposite direction, negative 2.58
5. falls below negative 2.042. Therefore, we'll reject the null. It appears that
6. meal prices in Wilma and Gettysburg are statistically different at a
7. significance level of .05. If we calculate the p value, remember our t
8. statistic is 2.58 and our degrees of freedom is 30. GraphPad tells us that the
9. two-tailed p value is .015, and that is indeed less than our alpha level of
10. .05. Great job. We're done with this example.