9. Measures of Center, Spread, and Position
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Organize the data into lists by first pushing the STAT button and then choosing Edit.
Minimum: 18
Lower Quartile: 23
Median: 25
Upper Quartile: 27
Maximum: 29
Interpretation: See solution.
To calculate the different statistical measures, we have to organize the information into a list. Push STAT, choose Edit,
and then enter the data into the first list.
Next, analyze the data by pressing the STAT button again and navigating to the CALC menu. Press ENTER once to select the 1-Var Stats
option and then again to select the list in which you entered the data (usually L1).
Although you may have to use the arrow keys to view it, the calculator will display all of the necessary statistical measures. We can find the minimum, lower quartile, median, upper quartile, and maximum. minX:& 18 (Minimum value) Q_1:& 23 (Lower quartile) med:& 25 (Median value) Q_3:& 27 (Upper quartile) maxX:& 29 (Maximum value) These quantities indicates that there are 18 students in the smallest math class and 29 students in the largest math class at Central High. We can also see that 25 % of the classes have less than 23 students, 50 % of the classes have less than 25, and 75 % of the classes have less than 27 students.