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
D
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