Question: 20. Appendix B Data Set: Forecast Errors Refer to Data Set 8 in Appendix B and subtract each actual high temperature from the high temperature

20. Appendix B Data Set: Forecast Errors Refer to Data Set 8 in Appendix B and subtract each actual high temperature from the high temperature that was forecast one day before.

The result is a list of errors. Assuming that all such errors have a standard deviation of 2.5°, use a 0.05 significance level to test the claim that all such errors have a mean equal to 0. What does the result suggest about the accuracy of the forecast temperatures?

8-4 BEYOND THE BASICS

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