题目 In regard to the chi-squared and F-distribution, each of the following is true EXCEPT which is false? 选项 A.Both the chi-squared and F-distribution are non-negative and positively skewed to [...]
题目 The following probability matrix gives the joint probabilities (the inner square represents joint probabilities) of variable X which can assume one of three values {1, 2, 3} and variable Y [...]
题目 What is the limit of the CDF as x tends to infinity? 选项 A.Less than 1.0 B.Equal to 1.0 C.Greater than 1.0 D.Depends on the degrees of freedom 答案 B 解析 It is part of the definition [...]
题目 Which distribution is discrete? 选项 A.Bernoulli B.Binomial C.Poisson D.All of the above 答案 D 解析 Bernoulli, binomial and Poisson are each a discrete [...]
题目 Which is most likely to characterize the frequency of operational losses? 选项 A.Bernoulli B.Binomial C.Poisson D.All of the above 答案 C 解析 Poisson泊松分布 [...]
题目 Which statement best describes correlations and variances in times of financial crisis? 选项 A.There are only marginal changes in correlations and variances in times of crisis and therefore [...]
题目 When will we use a t-test instead of using z-test: 选项 A.The sample size is small. B.The sample size is big. C.The variance of the population is known. D.The standard deviation is larger [...]
题目 A distribution of returns that has a greater percentage of small deviations from the mean and a greater percentage of extremely large deviations from the mean: 选项 A.is positively skewed. [...]
题目 The joint probability distribution of random variables X and Y is given by f(x,y) = k× x×y for x =1,2,3,y =1,2,3, and k is a positive constant. What is the probability that X+Y will exceed [...]
题目 An analyst is concerned with the symmetry and peakedness of a distribution of returns over a period of time for a company she is examining. She does some calculations and finds that the median [...]
