lecture+3 - January 14, 2008 [LECTURE 3] I. Stemplots: How...

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January 14, 2008 [ LECTURE 3 ] 1 I. Stemplots: How to make a stemplot: 1) Separate each observation into a stem, consisting of all but the final (rightmost) digit, and a leaf, which is that remaining final digit. Stems may have as many digits as needed, but each leaf contains only a single digit. 2) 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. 3) Write each leaf in the row to the right of its stem, in increasing order out from the stem. Example: Original data: 9, 9, 22, 32, 33, 39, 39, 42, 49, 52, 58, 70 II. Time plots (Line graphs): Use when there is a meaningful sequence, like time. The line connecting the points helps emphasize any change over time. Example: 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.
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lecture+3 - January 14, 2008 [LECTURE 3] I. Stemplots: How...

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