## Two Sample T-test Homework Help l Project l Assignment

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- GUI’s
- PMG
- Rcmdr
- Tests with two data vectors x, and y
- Boxplots for displaying more than two samples
- Data stored using a factor to label one of two groups; x ~ f;
- Matched samples
- The chisq.tests
- Goodness of fit
- Test of homogeneity or independence
- Two independent samples assuming equal variance
- Two independent samples no equal variance assumption
- Two Sample t-Test
- Purpose
- To compare responses from two groups. Two groups can come from different experimental treatments, different natural “populations”.

**Assumptions**

- Each group is considered as a sample from a distinct population
- The responses in each group are independent of those in other groups
- The distributions of the variable of interest are normal