Variance never has units. Suppose the students are given one hour to complete the exam. To study this, the number of burglaries committed each month in a small town were recorded for 75 months prior to passage of a bill requiring citizens to own guns and for 56 months after passage of the bill. The goal was to see if the number of burglaries committed was affected by requiring citizens to own guns. An experiment was conducted to investigate the effect of the rate of water flow on the amount of soil washed away.
Flow is measured in liters per second and the eroded soil is measured in kilograms.
The data are given in the following table. In a statistics class with 136 students, the professor records how much money each student has in their possession during the first class of the semester. The histogram below shows the data collected. In each class interval, the left endpoint is included but not the right. The point totals for the 10 students are given in the stemplot below.