Subject Mathematics General Statistics


Consider the data below of inches of rainfall per month for a region in the Northwestern United States:
April       20.1
May       15.3
June       19.8
July         17.4
August    16.8
Using SPSS, assume that the standard deviation of the population is 2.041 inches and find a 98% confidence interval for the average rainfall per month in this region. How many months’ worth of data would we need to look at to be sure that our margin of error is less than . 5?

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We can say from the above that the mean rainfall fall ranges between 14.459 and 21.301 inches with 98% confidence....

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