单项选择题

Assume thirty percent of the CFA candidates have a degree in economics. A random sample of three CFA candidates is selected. What is the probability that none of them has a degree in economics

A. 0.343.
B. 0.900.
C. 0.027.

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单项选择题Which of the following statements regarding confidence intervals is TRUE

A. The higher the alpha level, the wider the confidence interval.
B. The relationship between the alpha level and the confidence interval cannot be ascertained.
C. The lower the alpha level, the wider the confidence interval.

单项选择题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.