Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 3 - Statistics for Describing, Exploring, and Comparing Data - 3-4 Measures of Relative Standing and Boxplots - Basic Skills and Concepts - Page 126: 36

Answer

The higher lead group generally has a lower IQ than the lower lead group.

Work Step by Step

In order to create a box and whisker plot, we use a box and a whisker plot maker online. (To draw one by hand, we draw a line, making the far left point the minimum and the far right point the maximum. Then, we draw a box, where the left side of the box is $Q_1$ and the right side of the box is $Q_3$. Finally we draw a vertical line through the box: this is will be the median.) After doing this, we find that the high lead group has a box that is further left than the low lead group's. Hence the higher lead group generally has a lower IQ than the lower lead group.
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