Stopping+Distances+Notes

Back to Stopping Distances Credit: This activity was adapted from the NCTM publication “Navigating through Data Analysis in Grades 6-8”
 * Stopping Distance Teacher Notes**

Shodor boxplot GeoGebra 3. Five-point summaries: Small Sedans: 52, 54, 60.5, 70, 80 Large Sedans: 57, 63, 65.5, 68, 76 4. While half of the small sedans stop quicker than a quarter of the large sedans, some of them also are pretty slow in stopping. Half of the large sedans stop within four feet of each other. If we disregard the outlier, then all of the large sedans stop in 68 feet or less while the small sedans have three cars with higher stopping distances. 5. The IQR for small sedans is 16 feet and the IQR for large sedans is 5 feet. 6. There is a greater amount of variability in the data for the small sedans. In fact, the variability for the small sedans is three times the large sedans. [When comparing variability, try to use a ratio.] 7. The fourth interval is missing because there are no data points between the upper quartile (at 68 feet) and the outlier (at 76 feet). Two data point are stacked at 68 feet. 8. The upper fence is for the large sedan data is 68 +(1.5*5) = 75.5 feet. The car that stops at 80 feet is considered an unusual point or an outlier. 9. Answers will vary. Overall, the large sedans are more consistent in their stopping distance with a range of 19 feet versus a range of 28 feet for the small sedans.
 * Answers**

[|Shodor Interactives Box Plot instructions]

Henry Mesa - Statistics Tools: Compare a Histogram to Box Plot
 * Suggested You Tube Videos on for GeoGebra**

Martin Klausen - Statistics Tools: Parallel box plots not in English

Linda Fahlberg-Stoanovska - Box Plot Command on GeoGebra

Amy Kaye - Box Plot Command on GeoGebra Roger Marris data set