A histogram, or frequency distribution, is a type of graph that has bars representing data. Each bar represents a certain amount of data. Once you have input the data for the TI 89 histogram and graphed it, the TI-89 will even count how many items are in each bar (or class).
TI 89 Histogram: Steps
Watch the video or read the steps below:
Sample problem: Create a histogram for the following new car costs: 12,500; 22,400; 14,300; 32,200; 21,500; 19,980; 15,001; 22,001; 32,036; 35,124; 29,001; 25,006; 27,001; and 18,500.
Step 1: Press APPS and scroll to the Stats/List Editor. Press ENTER.
Step 2: Press F1 then 8 to clear the list editor of data.
Step 3: Enter “cars” as the list name by pressing 2nd ALPHA )=23 ENTER.
Step 4: Enter your data:
Step 5: Press F2 ENTER and F1 to go into Plot Setup (Define Plot).
Step 6: Press the right scroll arrow to bring up a menu for Plot Type. Press 4 for Histogram.
Step 7: Scroll down to “x” Press 2nd – (the minus key) to bring up Var-Link. Scroll down to “cars” and press ENTER.
Step 8:Scroll down to Hist. Bucket Width and enter 5000 ENTER. This is your class width.
Step 9: Press ENTER F5. Note: If you press ENTER too many times and end up at the home screen, just press the diamond key and then F3 (for graph).
Step 10: Press 3 for the trace function. Use the left and right scroll keys to move from one bar to another. (This will tell you how many items are in each class (n = x)).
Tip #1: If your TI 89 histogram doesn’t show (or only part of the graph shows), you may need to change the window. Press ♦ F2 to check your window settings. For the above graph, your settings should be approximately 10000 < x < 40000 and 0 < y < 8. Set the xscl and yscl to 1. Press F2 9 to return to the graph.
Tip #2: Make sure the alpha lock is turned on by checking for a little black box with “a” in it on the bottom left of your screen.
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