题目内容

Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following questions. The most detailed information about the woman robber is her ______.

A. manners
B. talkativeness
C. height
D. jewelry

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简述信用在现代经济中的作用。

Assume a discrete distribution for the number of possible sunny days in Provo, Utah during the week of April 20 through April 26. For this discrete distribution, p(x)=0 when x cannot occur, or p(x)＞0 if it can. Based on this information, what is the probability of it being surely on 5 days and on 10 days during the week 5 Days of Sunshine 10 Days of Sunshine（）①A. A positive value Infinite ②B. Zero Infinite ③C. A positive value Zero

A. ①
B. ②
C. ③

In order to test whether the mean IQ of employees in an organization is greater than 100, a sample of 30 employees is taken and the sample value of the computed test statistic, tn-1=3.4. The null and alternative hypothesis are:（）

A. H0: μ=100; Ha: μ≠100.
B. H0: μ≤100; Ha: μ＞100.
C. H0: X=100; Ha: X≠100.

A researcher is testing whether the average age of employees in a large firm is statistically different from 35 years ( either above or below). A sample is drawn of 250 employees and the researcher determines that the appropriate critical value for the test statistic is 1.96. The value of the computed test statistic is 4.35. Given this information, which of the following statements is FALSE The test:（）

A. is two- tailed.
B. indicates that the researcher will reject the null hypothesis.
C. has a significance level of 95%.