January 14, 2008
How to make a stemplot:
Separate each observation into a
consisting of all but
the final (rightmost) digit, and
which is that remaining final digit. Stems may have as many digits as needed, but
each leaf contains only a single digit.
Write the stems in a vertical column with the smallest value at the top, and draw a
vertical line at the right of this column.
Write each leaf in the row to the right of its stem, in increasing order out from the stem.
9, 9, 22, 32, 33, 39, 39, 42, 49, 52, 58, 70
Use when there is a meaningful sequence, like time. The line connecting the points helps
emphasize any change over time.
Time always goes on the horizontal, or x, axis. The variable of interest— here “retail
price of fresh oranges”—goes on the vertical, or y, axis.