爱考云 - 搜题找答案神器_海量试题解析在线查

题目 A Type I error occurs when the null hypothesis: 选项 A.fails to be rejected when it is false. B.is rejected when it is false. C.fails to be rejected when it is true. D.is rejected when it is [...]

题目 Which of the following statements about sampling and the central limit theorem is least likely correct? 选项 A.The variance of the distribution of sample means is \u03c32\/n. B.The central [...]

题目 Based on a sample size of 100 and sample mean of $30, you estimate a 95% confidence interval for the mean weekly soft drink expenditures of students at a local college. Your estimate of the [...]

题目 For a standard normal distribution, which of the following choices is the approximate area under the probability density function from values -1.96 to 1.96? 选项 A.50% B.66% C.75% D.95% [...]

题目 You sample 25 observations from a sample of unknown variance. You calculate a sample mean of 70 and sample standard deviation of 60. You wish to conduct a two-tailed test of the null [...]

题目 An analyst is conducting a two-tailed z-test to determine if small cap returns are significantly different from 10%. The sample size is 200 and the computed z-statistic is 2.3. Using a 5% [...]

题目 Let random variable W be distributed normally as N(0,10). What are, respectively, the following: 1)The fourth moment of ; and 2)The kurtosis of W? 选项 A.30.0 (4th moment) and zero [...]

题目 An investment analyst takes a random sample of 100 aggressive equity funds and calculates the average beta as 1.7. The sample betas have a standard deviation of 0.4. Using a 95% confidence [...]

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 [...]