A psychiatrist believes that children under stress will have a higher variability in their achievement test scores than those who are not under stress

A psychiatrist believes that children under stress will have a higher variability in their achievement test scores than those who are not under stress. A sample of 10 children under stress showed a standard deviation of 19 points on their achievement scores and a sample of 7 children not under stress had a standard deviation of 10.5 points on their achievement tests. At = 0.05, is the psychiatrist’s claim justified?

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