The standard normal distribution is most completely described as a:（）
A. symmetrical distribution with a mean equal to its median.
B. normal distribution with a mean of zero and a standard deviation of one.
C. distribution that exhibits zero skewness and no excess kurtosis.
查看答案
When is the t- distribution the appropriate distribution to use The t -distribution is the appropriate distribution to use when constructing confidence intervals based on:（）
A. small samples from populations with known variance that are at least approximately normal.
B. large samples from populations with known variance that are nonnormal.
C. small samples from populations with unknown variance that are at least approximately normal.
Which one of the following statements about the t - distribution is TRUE（）
A. The t- distribution is the appropriate distribution to use when constructing confidence intervals based on large samples.
B. Compared to the normal distribution, the t -distribution is more peaked with more area under the tails.
C. The t - distribution approaches the standard normal distribution as the number of degrees of freedom becomes large.
An equity analyst needs to select a representative sample of manufacturing stocks. Starting with the population of all publicly traded manufacturing stocks, she classifies each stock into one of the 20 industry groups that form the Index of" Industrial Production for the manufacturing industry. She then selects a number of stocks from each industry based on its weight in the index. The sampling method the analyst is using is best characterized as:（）
A. data mining.
B. nonrandom sampling.
C. stratified random sampling.
Which of the following statements regarding the speed at which analysts believe stock prices reflect new information is most likely accurate（）
A. Technicians believe that prices adjust quickly to new information.
Both technicians and followers of the efficient market hypothesis believe prices adjust slowly to new information.
C. Followers of the efficient market hypothesis believe prices adjust quickly to new information.
微信支付 
支付宝支付