题目
An analyst is concerned that the trading strategy she recently identified has generated a statistically insignificant result and has asked for guidance in assessing the strategy. A result is statistically significant if it is:
选项
A.Unlikely to have occurred merely by chance, and the p-value is less than the significance level.
B.Likely to have occurred merely by chance, and the p-value is less than the significance level.
C.Unlikely to have occurred merely by chance, and the p-value is greater than the significance level.
D.Likely to have occurred merely by chance, and the p-value is greater than the significance level.
答案
A
解析
A result is statistically significant if it is unlikely to have happened by chance. The decision rule is to reject the null hypothesis if the p-value is less than the significance level. If the p-value is less than the significance level, then we conclude that the sample estimate is statistically different than the hypothesized value. 如果结果不太可能是偶然发生的，则该结果具有统计意义。 如果p值小于显着性水平，则决策规则将拒绝原假设。如果p值小于显着性水平，那么我们得出结论，样本估计值在统计上与假设值不同。