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Chapter 1: Q. 10 (page 22)
The solutions also deals with the percentages of email spam and the email failing
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Refer to Exercise . We suspect that the more serious soccer players have more arthritis later in life. Do the data confirm this suspicion? Give graphical and numerical evidence to support your answer.
Healthy cereal? Researchers collected data on brands of cereal at a local supermarket. For each brand, the sugar content (grams per serving) and the shelf in the store on which the cereal was located ( = bottom, = middle, = top) were recorded. A dot-plot of the data is shown below. Compare the three distributions. Critics claim that supermarkets tend to put sugary kids鈥� cereals on lower shelves, where the kids can see them. Do the data from this study support this claim?
The National Survey of Adolescent Health interviewed several thousand teens (gradesto ). One question asked was 鈥淲hat do you think are the chances you will be married in the next ten years?鈥� Here is a two-way table of the responses by gender:
What percent of those who thought they were almost certain to be married were female?
(a) About (c) About (e) About
(b) About (d) About
Comparing AP scores The table below gives the distribution of grades earned by students taking the AP Calculus AB and AP Statistics exams in
(a) Make an appropriate graphical display to compare the grade distributions for AP Calculus AB and AP Statistics.
(b) Write a few sentences comparing the two distributions of exam grades.
Do women study more than men? We asked the students in a large first-year college class how many minutes they studied on a typical weeknight. Here are
the responses of random samples of women and men from the class:
(a) Examine the data. Why are you not surprised that most responses are multiples of 10 minutes? Are there any responses you consider suspicious?
(b) Make a back-to-back stem plot to compare the two samples. Does it appear that women study more than men (or at least claim that they do)? Justify your answer.
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