3 In a large city the distribution of incomes per family has a standard deviation of $5200. (i) For a random sample of 400 families, what is the probability that the sample mean income per family is within $500 of the actual mean income per family? (ii) Given that the sample mean income was, in fact, $8300, calculate a 95% confidence interval for the actual mean income per family.

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Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.