Question: Sample size = 81, sample mean = 4.5 km, sample standard deviation = 3.1 km Assume that population means are to be estimated from the

Sample size = 81, sample mean = 4.5 km, sample standard deviation = 3.1 km Assume that population means are to be estimated from the samples described. In each case, use the sample results to approximate the margin of error and 95% confidence interval.

95% confidence interval E=margin of error E = margin of error -E

95% confidence interval E=margin of error E = margin of error -E Sample proportion p P+E

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