ex06.02 data frame has 21 rows and 1 column.
A data frame with 21 observations on the following variable.
a factor with levels
Consult the web site http://www.thomsonedu.com/statistics/devore for additional online resources that are available for this book.
Devore, J. L. (2008) Probability and Statistics for Engineering and the Sciences (7th Edition), ISBN-10: 0495382175 ISBN-13: 9780495382171
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