Commuting students get to school by various means of transportation, such as taking a bus, driving a car, or walking. We may suspect that students who walk would tend to be youngest (because they are fittest or have the least money) whereas students who drive a car would tend to be oldest (because they are least fit or have the most amount of money).
a. Use software to access the student survey data. Report the mean ages of students who commute by bus, car, or walking.
b. Which group is youngest on average?
c. Which group is oldest?
d. Report the median ages.
e. Which group has the lowest median?
f. Which group has the highest median?
g. There were three students who commuted by bike. Which estimate should be better: using their sample mean age to estimate the mean age of all students who commute by bike, or using the sample mean age of 110 walkers to estimate the mean age of all students who commute by walking; or should the estimates be equally good?