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"quantity"exercise: Expected value
学习是一个不断积累的过程，每天学习一点，每天进步一点！为了帮助大家更高效地备考2021年CFA考试，正保会计网校每日为大家上新CFA习题供大家练习。让网校与您一起高效备考2021年CFA考试，梦想成真！
Questions 1:
The variance of returns of Asset A is 625. The variance of returns of Asset B is 1,225. The covariance of returns between Asset A and Asset B is 600. The correlation of returns between Asset A and Asset B is closest to:
A 、0.29.
B、 0.69.
C、 0.47.
Questions 2:
Survivorship bias is most likely an example of which bias?
A 、Sample selection
B、 Data mining
C、 Look-ahead
View answer resolution
【Answer to question 1】B
【analysis】
【Answer to question 2】A
【analysis】
A is correct. Sample selection bias often results when a lack of data availability leads to certain data being excluded from the analysis. Survivorship bias is an example of sample selection bias.
B is incorrect. Data mining bias relates to the overuse of the same or related data, i.e., searching for pattern. And survivorship bias is not an example of data mining bias.
C is incorrect. Look-ahead bias exists if the model uses data not available to the analyst at the time the analyst act on the model. Survivorship bias is not an example of look-ahead bias.
成功=时间+方法，自制力是这个等式的保障。世上无天才，高手都是来自刻苦的练习。而人们经常只看到“牛人”闪耀的成绩，其成绩背后无比寂寞的勤奋。小编相信，每天都在勤奋练习，即使是一点点的进步，大家一定可以成为人人称赞的“牛人”。更多CFA考试资讯，点击了解>
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