Chapter4 stat

# Chapter4 stat - Chapter 4 Displaying Quantitative Data...

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Chapter 4 Displaying Quantitative Data

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Exercise #14 page 65 The Cornell Lab of Ornithology holds an annual Christmas Bird Count, in which bird watchers at various locations around the country see how many different species of birds they can spot. Here are some of the counts reported from sites in Texas during the 1999 event. 228 178 186 162 206 166 163 183 181 206 177 175 167 162 160 160 157 156 153 153 152
How to display a Quantitative Variable? With quantitative variables, life is different. Usually we can’t list all the individual values (there may too many). So instead, we slice up the entire span of values covered by the quantitative variable into equal-width piles called bins . Then, we count the number of values that fall into each bin. The bins and the counts in each bin give the distribution of the quantitative variable.

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Going back to the bird species example, we are going to make a table just like a frequency table. Remember, the bins
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Chapter4 stat - Chapter 4 Displaying Quantitative Data...

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