(5 points out of 9) duction Objective 1 Objective 2 Objective 3 Objective 4 Obje

Question

(5 points out of 9) duction Objective 1 Objective 2 Objective 3 Objective 4 Objective 5 9.2.45 0.27 of 1 Point A doctor wants to estimate the mean HDL cholesterol of all 20-to 29-year-old females. assuming 19 1 based on earlier studies? Suppose te doctor would be content wit 90% confidence How does te decrease n confidence afed the sample size required? How many subjects are needed to estimate the mean HDL cholesterol within 4 points with 99% cofidence A 99% confidence level requires subjects. (Round up to the nearest subject.) Clear All Fs : sc

Explanation / Answer

At 99% confidence interval the critical value is 2.58

Margin of error = 4

Or, z* * SD/sqrt(n) = 4

Or, 2.58 * 19.1/sqrt(n) = 4

Or, sqrt (n) = 2.58 * 19.1/4

Or, sqrt(n) = 12.32

Or, n = 151.78 = 152

Or, n = 2

At 90% confidence interval the critical value is 1.645

1.645 * 19.1/sqrt(n) = 4

Or, sqrt(n) = 7.85

Or, n = 61.62 = 62

As the confidence level decreases, the sample size also decreases.

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