If the homogeneity of variance assumption is violated in an independent groups t test, this means _________.
a. the populations from which the samples were drawn have different standard deviations
b. you should use the sign test
c. the sample sizes should be equal and N greater than 30 to use the t test
d. the populations from which the samples were drawn have different standard deviations and the sample sizes should be equal and N greater than 30 to use the t test
e. all of these
Question 2
Assuming large between subject variability, which of the following tests is usually the most sensitive (N held constant)?
a. t test for correlated groups c. t test for independent groups
b. sign test d. they are all equal in sensitivity
In the summer of 1793, a yellow fever epidemic struck Philadelphia, killing nearly 4,000. Tens of th
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