Articles by skycondition

Unknown Variance Two-Tailed Test of Population Mean

February 11, 2013 | skycondition

Question The mean safety audit score of ACME Co. stores in New York (n=200) was 74.3pts February last year.  Suppose we decided to sample 22 out of the 200 stores one year later. We find that the sample mean is 78.6pts and the sample standard deviation is 3.2pts.  Can we reject the ... [Read more...]

Correlation: Easy as 1-2-3?

November 1, 2012 | skycondition

I recently had a task to take a look at some assessment (audit) data. I was assuming, rather hoping for data with a normal distribution and thought it would be a quick case of Pearson correlation between two columns: "Duration" and "Score". Just conjecture at this point as I did ... [Read more...]

Tidbit: Correlation and Simple Linear Regression

October 19, 2012 | skycondition

In business "Correlation" is generically used as a mutual relationship or connection between two or more things; statistically speaking correlation is the interdependence of variable quantities. I overhear many end users request information on the correlation of variables for prediction use, what they are referring to is actually simple linear ... [Read more...]

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