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## t-TESTS

- Often times, we are interested in knowing whether or not the means of two independent groups are truly different or if the observed difference merely occurred by chance
- If you tested one class who was taught standard math on an achievement test and another class who was taught new math on the same test, could we truly say that there was a difference between the two groups?
- The answer lies in a statistic called the t test. This particular t test is designed for independent groups (different subjects): See Equation Above