8. In 2007, Roslyn High School instituted a safe driver course for all students who have licenses.
They want to statistically analyze if the course is working. The side-by-side box-and-whisker
plots give the annual number of car accidents involving Roslyn students for those two 10-year
periods.
1997-2006
2007-2016
32
29
35
23 31
41 49
56
14
a. What is the median number of annual accidents for the years 1997-2006? The years 2007-
2016?
b. What is the range of the annual accident figures for the years 1997-2006? The years 2007-
2016?
c. What do the side-by-side boxplots tell about the safe driver program that Roslyn High
School instituted? Explain.
d. John claims that 75% of the data for the years 2007-2016 are less than the first quartile for
the years 1997-2006. Is he correct? Explain.