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A sample of 240 managed portfolios has a mean annual return of 0.11 and a standard deviation of returns of 0.23. The standard error of the sample mean is closest to:

A. 0.01485.

B. 0.00096.

C. 0.00710.

解析│✘│·│:選A│•·。樣本標準誤 = 總體標準差 / 樣本量的平方根 = 0.23 / (240)^0.5 = 0.01485

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戳│✘│·│:各科必背定義+歷年真題中文解析+學習備考資料(PDF版)

A fund manager would like to estimate the probability of a daily loss higher than 5% on the fund he manages. He decides to use a method that uses the relative frequency of occurrence based on historical data. The resulting probability is best described as a(n):

A. subjective probability.

B. a priori probability.

C. empirical probability.

解析│✘│·│:選C│•·。要區分幾種機率的定義│✘│·│:

經驗機率(empirical probability)│✘│·│:根據歷史資料來估計

先驗機率(priori probability)│✘│·│:透過對問題的推理來推斷出機率

其中✘₪,經驗機率與先驗機率屬於客觀機率(objective probabilities)

主觀機率(subjective probability)│✘│·│:基於個人或主觀判斷

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