3 (i) 0.9456 (ii) $7790–$8810

Question and answer key 3 (i) 0.9456<br>(ii) $7790–$8810<br>

Extracted text: 3 (i) 0.9456 (ii) $7790–$8810

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

Extracted text: 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. (MEL adabtad

Jun 09, 2022

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3 (i) 0.9456 (ii) $7790–$8810

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