The author conducted a study of the accuracy of weather forecasts by recording the actual high temperatures along with the high temperatures that were forecast 5 days earlier. Differences (actual minus forecast) for 35 days are listed be¬low. Use α 0.05 significance level with the sign test to test the claim that the population of dif¬ferences has a median of zero. What do the results suggest about the accuracy of the forecasts?
Use a 0.05 significance level with the indicated test. If no particular test is specified, use the appropriate nonparametric test from this chapter.
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