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The assumption of homogeneity of variance is met when:

a. The variance in one group is twice as big as that of a different group

b. The variance across groups is proportional to the means of those groups

c. Variances in different groups are approximately equal

d. The variance is the same as the inter-quartile range

a. The variance in one group is twice as big as that of a different group

b. The variance across groups is proportional to the means of those groups

c. Variances in different groups are approximately equal

d. The variance is the same as the inter-quartile range

Suppose you are told that a list of the weights of 25 persons (measured in pounds) follows the normal curve and that the range of the numbers in the list is 48 pounds. Which of the following is the most likely to be the standard deviation of the numbers in the list?

b. Justify your answer to the previous question in one to two sentences.

b. Justify your answer to the previous question in one to two sentences.

8 pounds

b. Under a normal curve with a small sample it is unlikely that anybody would be more than 3 SD away or that everybody would be within 1 SD.

One way to think about the problem is for you to draw a normal curve and put the low point and the high point to correspond to the range with the midpoint corresponding to the mean. Then look at it and think about standard deviations.

b. Under a normal curve with a small sample it is unlikely that anybody would be more than 3 SD away or that everybody would be within 1 SD.

One way to think about the problem is for you to draw a normal curve and put the low point and the high point to correspond to the range with the midpoint corresponding to the mean. Then look at it and think about standard deviations.

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