李同学2019-02-07 16:15:28

For a sample size of 17, with a mean of 116.23 and a variance of 245.55, the width of a 90% confidence interval using the appropriate t-distribution is closest to: A 13.23. B 13.27. C 13.68. 查看解析 下一题 正确答案B 您的答案A本题平均正确率：42% Confidence interval for a population mean难度：一般 推荐：      答案解析 The confidence interval is calculated using the following equation: Therefore, the interval spans 109.5943 to 122.8656, meaning its width is equal to approximately 13.271. (This interval can be alternatively calculated as 6.6357 × 2.) 请问：这题的表是不是没有附件上？还有考试的时候 t分布的表 是会附加每道题目上吗？