Discuss the following:
Students collected data for a project for statistics class, and were asked to find the mean, median, mode, range, upper quartile, lower quartile, interquartile range, and standard deviation. Then, they were asked to plot the data in a stem-and-leaf plot, dot plot, histogram, and box-and-whisker plot. Explain how the students would calculate quartiles and why different methods produced slightly different results. Give an example.