Identify the explanatory and response variables in this study. Classify the variables in this study as categorical

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Identify the explanatory and response variables in this study. Classify the variables in this study as categorical or quantitative.


As mentioned earlier, sand is used in the filter. Different filters had different amounts of sand.

The students split the filters into two groups: those that had more than 2 inches of sand and those that had less. We will explore whether this difference results in different E. coli counts when filtering the water. In this sample, we have results from 20 filters, 14 with more than 2 inches of sand and 6 with less than 2 inches of sand. (See data file Ecoli-sand.)

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Introduction To Statistical Investigations

ISBN: 9781118172148

1st Edition

Authors: Beth L.Chance, George W.Cobb, Allan J.Rossman Nathan Tintle, Todd Swanson Soma Roy

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