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?

Please attach your Word file and, in a written analysis, explain what your conclusion is.

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1. We saved the datafile as .csv and load to R. Here’s the code:

> data <- read.csv("wk9_tech_data-3-.csv",header=TRUE)
> attach(data)
> mean <- mean(Plains)
> z <- qnorm(0.99)
> n<-length(Plains)...

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