BOX and DOT PLOTS

BOX PLOTS

What is a box plot?

• a box and whisker plot (aka a box plot)

• shows the five numbers of summary: minimum, lower quartile (Q1), median (Q2) , upper quartile (Q3), and maximum.

To find the Median (Q2)..make sure your data is re-ordered from lowest to highest...then find the middle value of the data..

• let's look at the following example

When the number of data values is an even number...find the mean of the two middle values as seen in the previous example.

DOT PLOTS

WHAT IS A DOT PLOT?

• a number line long enough to include all the number in a given sample.

• showing dots over the position corresponding to each value.