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TI-83 Worksheet Number 21 Statistics – Histograms Following is a list of countries and the percent of ninth graders who have used marijuana. Make a histogram of the data. Austria 10% France 12% Italy 19% Portugal 7% Belgium 19% Germany 21% Luxembourg 6% Scotland 53% Denmark 17% Greece 2% Netherlands 31% Spain 15% England 40% Iceland 10% No. Ireland 23% Sweden 6% Finland 5% Ireland 37% Norway 6% Switzerland 27% The histogram will show the “percent usage” categories on the x-axis and the number of countries in the individual categories on the y-axis. We need only to enter the percentages, not the countries. A histogram is a one-variable display graph. Key Strokes (Enter Data) Stat 1 (Clear list if not empty) ▲◄ Clear Enter 10 Enter 19 Enter …27 Enter 2nd Statplot 1 Enter ▼►► www.mikeshoreline.com 6/26/2017 Comment Displays the statistics menu Selects the list editor Move cursor to highlight L1 Clears list 1 Enters the percentages in the list Displays statplot menu Selects first of 3 statplots Turns statplot 1 on Highlights the histogram icon (3rd type) WS 21 Page 1 of 2 Enter ▼ 2nd L1 ▼1 Zoom 9 Trace ► (Change the range of data an the width of intervals) Window Xmin=0 Xmax=60, Xscl=10 Graph Trace www.mikeshoreline.com 6/26/2017 Selects histogram type Selects L1 as XList Sets frequency to one (If you can’t type a 1, it is because the calculator is in alpha mode. Hit the ALPHA key to take calculator out of alpha mode. Selects standard statistics window – Displays histogram Displays properties of the histogram. Indicates the first intgerval category is [2, 12.2), and n=9 numbers in that category. Indicates the second category is [12.2, 22.4) and n=6 numbers in that categroy Displays window settings. Xscl=10 sets the size of the categories at 10 units wide Displays the histogram with the revised range and category size. WS 21 Page 2 of 2