Patty Plainte wants to compare the final grades of the students in Mr. Mean's class with those in Ms. Nice's class. (Patty is a student in Mr. Mean's class, and thinks that her teacher's nasty personality is the reason she did so poorly in the course.) Patty has managed to collect a random sample of final grades from the students in the two classes. She has created the two histograms shown in Exhibit 2.47 on the next page so that she can make her comparison.
Do you think that Patty deserved her low mark in statistics, based on these graphs? What would you do to improve the graphs?
Answer to relevant QuestionsCreate an appropriate graph to summarize the "speed of service "rating data for the survey of drugstore customers. Comment on the data. Suppose you are the sales manager at a car dealership. You want to examine data on past sales, with an eye to planning sales activities for the next year. Should you look at annual or monthly sales? Why? Lynda Parks is wondering whether the size of a customer's most recent purchase at her drugstore is related to the customer's income. Create an appropriate graph for the data from the survey, and comment. Exhibit 2.84 below is one method of displaying the data on ice cream flavour preferences, first described in Develop Your Skills 2.3, Exercise 15, on page 70. Comment on this graph as a way of displaying the data. A new analyst at a soft drinks company was preparing a graph to illustrate the company’s net operating revenues over the last five years. He decides the graph is boring so he adjusts it. The resulting graph is shown in ...
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