Suppose That 6 Economists Who Work for the Federal Government

Multiple Choice

Suppose that 6 economists who work for the federal government and 7 university economists were asked to predict the percentage change in the Canada's GDP over the three year period from January 2013 to January 2016. The Wilcoxon rank-sum test was used to determine if the two groups differ in their predictions. The value of the test statistic was calculated to be 29.5. At α = 0.05, we can conclude that

A) the null hypothesis should be rejected.
B) the alternative hypothesis should not be rejected.
C) there is a difference in predictions provided by the two groups of economists.
D) since TL= 28 < 29.5 < TU = 56, we can conclude that two groups of economists have different predictions.
E) the null hypothesis should not be rejected; there is no significant difference in predictions provided by the two groups of economists.