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Part I Practice Problems on Descriptive Statistics from www.businessbookmall.com
Formula Reviews From Quick Notes Statistics may help with these problems.
When printing, highlight just the problems and not the advertising and then choose File, Print, Section, and OK.

Calculate the following using this sample data. Where appropriate, state the symbol for the 
measure and the formula used. Those not using a calculator or computer should show all work.

Data: 20, 6, 15, 22, 13, 9, 2, 20, 10     

Problem Answers

1.    Mean

2.   Median

4.  Variance

6    Pearson's Coefficient of skewness

7.    85^th percentile

8.    Third decile

9.  Interquartile range

10.    Use a paragraph or two containing complete sentences to define two variables, one that is skewed positively and one that is skewed negatively. Explain why you think the data is skewed.