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题目
BTRY3010/BTRY5010/STSCI2200/STSCI5200 Lecture#21 (Pages 102-103)
简答题
Compute the sample size needed to compute a 98% Confidence Interval for a mean. Use a desired margin of error E=1.1 and an estimated standard deviation of 𝜎 = 6.2. To find the sample size round up the value obtained from this formula: 𝑛 = ( 𝜎 × 𝑧 𝛼 2 𝐸 ) 2 (Note: When computing the critical value 𝑧 𝛼 / 2 that is used in this formula, round it to two decimal places before you plug it into the formula) c07.p062.q002
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标准答案
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思路分析
Restate the problem: We need the sample size n for a 98% confidence interval for a mean, with margin of error E = 1.1 and estimated standard deviation σ = 6.2. The formula to use is n = (σ × z_{α/2} × 1 / E)^2, and we should round the z_{α/2} v......Login to view full explanation登录即可查看完整答案
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