Topic: Why do we need to study the variation of a collection of data? Why isn't the average by itself adequate? Instructions: Write a brief but complete essay, in which you summarize the main points. Please include formulas and graphs as appropriate. We have studied three ways to measure variation: the range, standard deviation, box-and whisker plot. They all indicate the variation within data collection. Discuss similarities and differences among these ways to measure data variation. Why would it seem reasonable to pair the median with a box-and-whisker plot & to pair the mean with the standard deviation? What are the advantages and disadvantages of each method of describing data spread? Comment on statements such as following: a) The range is easy to compute, but it doesn't give much information; b) Although the standard deviation is more complicated to compute, it has some significant applications; c) The box-and-whisker plot is fairly easy to construct and it gives a lot of information at a glance.