劉同學(xué)
2018-05-21 16:26A sample of 100 observations drawn from a normally distributed population has a sample mean of 12 and a sample standard deviation of 4. Using the extract from the z-distribution given below, find the 95% confidence interval for the population mean. The 95% confidence interval is closest to: A 7.840 to 27.683 B 11.216 to 12.784 C 11.340 to 12.660 什么時候用12+1.96*4，什么時候用12+1.96*4/100根號下呢？
所屬：CFA Level I 視頻位置 相關(guān)試題
來源： 視頻位置 相關(guān)試題
1個回答
張瑋杰助教
2018-05-21 17:19
該回答已被題主采納
同學(xué)你好，答案里面只是括號括到了后面，區(qū)間估計的計算是點估計加減關(guān)鍵值*點估計的標(biāo)準(zhǔn)差，所以這兩個是一個東西，4/根號下100就是0.4
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