题目 In ABC Company, the mean age of the 100 employees is 35 and the standard deviation is 15. Assuming that the ages are normally distributed and using 95% confidence level, we can say that the [...]
题目 Which of the following statements regarding hypothesis testing is incorrect? 选项 A.Type II error refers to the failure to reject the null hypothesis when it is actually false. B.Hypothesis [...]
题目 MallRat is a real estate investment trust (REIT). During calendar year 2017, MallRat produced an average weekly (n = 52) return of +20 basis points with volatility of 19 basis points. Its [...]
题目 The correlation of returns between Stocks A and B is 0.60. The covariance between these two Securities is 0.0043, and the standard deviation of the return of Stock B is 26%. The variance of [...]
题目 Roger collects a set of 61 daily returns over a calendar quarter for the stock of XYZ corporation. He computes the sample's daily standard deviation, which is annualized in order to generate a [...]
题目 As research analyst at his firm, Richard Starr is assigned the task of examining the relevance of the capital asset pricing model by running hypothesis tests on the risk-free rate and the [...]
题目 A random sample of twenty (n = 20) publicly-traded retailers produces a sample average price-to-earnings (P/E) ratio of 20.00 with sample standard deviation of 8.50. We are interested in [...]
题目 A new equity fund called Machine Trade Bet is managed by an artificially intelligent bot who utilizes machine learning. The fund claims that its true (population) volatility does not exceed [...]
题目 Suppose the standard deviation of a normal population is known to be 10 and the mean is hypothesized to be 8. Suppose a sample size of 100 is considered. What is the range of sample means that [...]
题目 You want to test at the 0.05 level of significance that the mean price of luxury cars is greater than $80,000. A random sample of 50 cars has a mean price of $88,000. The population standard [...]
