问题如下:
2. The value of the calculated test statistic is closest to:
选项:
A. z = 1.97.
B. z = 1.42
C. z = 0.20
D. z = 0.49
解释:
B is correct.
考点:Hypothesis Test
解析:z = (289,750-280,000) / (48,000/49^0.5) = 1.42
单尾significant level是5%的分位点为1.645,计算出来的test statistic是1.42,且拒绝域看备择假设符号,1.42比1.645小,得出没有落啊拒绝域,结论就是不拒绝原假设。这样分析对吧?