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4. Explain, in your own words, what is the use of a grade point average. In other words, why in some cases do we calculate

4. Explain, in your own words, what is the use of a grade point average. In other words, why in some cases do we calculate the weighted average of two variances?

5. The formulas for the three different t-tests for two samples are all different from each other. However, all three have a common form. What shape do they follow exactly?

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