Predictions provided by the two groups of economists

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Suppose that 6 economists who work for the federal government and 7 university economists were asked to predict the percentage change in the U.S. GNP over the three year period from January 2010 to January 2013. 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 alpha α=?0.05, what can be? concluded?

I. The null hypothesis should be rejected.

II. The null hypothesis should not be rejected.

III. There is a difference in predictions provided by the two groups of economists.

Reference no: EM132422212

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