Use the equation for variance below, along with the given data set, to answer the following questions. Sigma squared = StartFraction (x 1 minus mu) Squared + (x 2 minus mu) squared + ellipsis + (x N minus mu) squared Over N EndFraction What does the numerator evaluate to? What does the denominator evaluate to? The variance equals:

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Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?