Question

Consider the data below of inches of rainfall per month for a region in the Northwestern...

Consider the data below of inches of rainfall per month for a region in the Northwestern United States: Plains

April 25.3

May 17.1

June 18.9

July 17.3

August 16.8

Using SPSS, find a 90% confidence interval for the average rainfall per month in this region. Be sure to set the test value to 0 if you have no specific value in mind and SPSS will find the confidence interval for how far off your mean is from 0. Using the formula from the Week 7 notes and hand calculations, how many months’ worth of data would we need to look at to be sure that our margin of error is less than 3 ??.?

Math   Statistics-And-Probability   
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Answer #1

SPSS output:

One-Sample Statistics
N Mean Std. Deviation Std. Error Mean
VAR00001 5 19.0800 3.57099 1.59700
One-Sample Test
Test Value = 0                                       
t df Sig. (2-tailed) Mean Difference 90% Confidence Interval of the Difference
Lower Upper
VAR00001 11.947 4 .000 19.08000 15.6754 22.4846

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