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题目 An analyst is concerned that the trading strategy she recently identified has generated a statistically insignificant result and has asked for guidance in assessing the strategy. A result is [...]

题目 A two-sided but very thick coin is expected to land on its edge twice out of every 100 flips. And the probability of face up (heads) and the probability of face down (tails) are equal. When [...]

题目 What can be said about a distribution that has fatter tails than a normal distribution (given the same variance)? 选项 A.It has a positive kurtosis. B.It has a negative kurtosis. C.It has a [...]

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 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 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 [...]

题目 X and Y are discrete random variables with the following joint distribution; Pr (X = 4,Y = 30) = 0.07.「huixue_img/importSubject/1564169386363850752.png」What is the conditional standard [...]

题目 The annual marginal probability of default of a bond is 15% in year 1 and 20% in year 2. What is the probability of the bond surviving (i.e. no default) to the end of two years? 选项 A.68% [...]

题目 If a distribution with the same variance as a normal distribution has kurtosis greater than 3, which of the following is TRUE? 选项 A.It has fatter tails than normal distribution. B.It has [...]

题目 If n is very large and p is small, the Poisson distribution may be used to approximate the binomial distribution with: 选项 A.\u03bb=np B.\u03bb=np(1-p) C.\u03bb=n\/p D.\u03bb=n\u221ap [...]