劉同學
2024-07-22 21:56A pooled estimator is used when testing a hypothesis concerning the:A.equality of the variances of two normally distributed populations.B.difference between the means of two approximately normally distributed populations with unknown but assumed equal variances.C.difference between the means of two at least approximately normally distributed populations with unknown and assumed unequal variances.這道題沒太明白啥意思
所屬：CFA Level I > 數(shù)量+金融計算器前導 視頻位置 相關試題
來源： 視頻位置 相關試題
1個回答
Bingo助教
2024-08-14 17:52
該回答已被題主采納
同學你好，
A pooled estimator is used when testing a hypothesis concerning the:
A.equality of the variances of two normally distributed populations.
B.difference between the means of two approximately normally distributed populations with unknown but assumed equal variances.
C.difference between the means of two at least approximately normally distributed populations with unknown and assumed unequal variances.
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追答
同學你好，
如圖，Sp的平方就是pooled estimator（綜合估計量），是在：
1.檢驗兩個正太分布的總體均值是否相等
2.其中總體方差未知但是假定相等
這兩個條件下使用的
考綱不要求掌握其公式，但是題目如果給出公式，要求會帶入數(shù)值計算的，定性方面需要了解截圖內的描述。
題目：
當檢驗以下哪一個假設時，使用綜合估計量(pooled estimator)：B
A 兩個正態(tài)分布的方差是否相等。
B 兩個近似正態(tài)分布的總體均值是否相等，方差未知但假設相等。
C 兩個近似正態(tài)分布的總體均值是否相等，方差未知但假設不相等。
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