>
    <p>A data frame/tibble with ten observations on two variables</p><dl><dt>company</dt>
<dd><p>a vector with values <code>manufacturer</code> and <code>competitor</code></p></dd>
 
<dt>emission</dt>
<dd><p>carbon monoxide emitted</p></dd>
 

</dl></div>
    <div id="references">
    <h2>References</h2>
    <p>Kitchens, L. J. (2003) <em>Basic Statistics and Data Analysis</em>.
Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.</p>
    </div>

    <div id="ref-examples">
    <h2>Examples</h2>