 Filters to Reduce Automobile Pollution
</h2>

<h3>Description</h3>

<p>Measurements of noise levels for different filters to reduce pollution levels of automobiles.
</p>


<h3>Format</h3>

<p>A dataset with 36 observations on the following 4 variables.
</p>

<table>
<tr>
 <td style="text-align: right;">
    <code>Noise</code> </td><td style="text-align: left;"> Noise level (decibels)</td>
</tr>
<tr>
 <td style="text-align: right;">
    <code>Size</code> </td><td style="text-align: left;"> Vehicle size: <co