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15. A psychopathologist records the number of criminal offenses among teenage drug users in a nationwide sample of 1,201 participants. To measure the variance of

15. A psychopathologist records the number of criminal offenses among teenage drug users in a nationwide sample of 1,201 participants. To measure the variance of criminal offenses, he computes SS = 10,800 for this sample. (a) What are the degrees of freedom for variance? (b) Compute the variance and standard deviation.

and based on the emprocal rule

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