"quantity"exercise: Hypothesis Testing
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:
A parametric test is most likely preferred to a non-parametric test when:
A .the data are given in ratio or ordinal scale.
B .defined sets of assumptions are given.
C .the population is heavily skewed.
Questions 2:
The conditional expected value of a random variable is best described as the:
A .expected value of a random variable given an event or scenario.
B .probability-weighted average of the possible outcomes of the random variable.
C. weighted average of the probabilities of an event given all possible scenarios.
B is correct. A parametric test is more appropriate than a non-parametric one when an analyst is concerned with parameters whose validity depends on a definite set of assumptions—for example, assumptions about the distribution of the population producing the sample.
A is incorrect. A nonparametric test is suitable for this case.
C is incorrect. A nonparametric test is also suitable for this
A is correct. The conditional expected value of a random variable is the expected value of a random variable given an event or scenario.
B is incorrect because an expected value (not a conditional expected value) is defined as the probability-weighted average of the possible outcomes of the random variable.
C is incorrect because an expected value is not a probability. This answer defines the total probability rule, which is the weighted average of the probabilities of an event given all possible scenarios
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”。
