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Chapter 1: Q. 53. (page 48)
U.S. women鈥檚 soccer鈥�2016 Refer to Exercise 47. Describe the distribution.
Right skewed
Single peak at 1 goal
Gap between 6 and 8 goals
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Spam Email spam is the curse of the Internet. Here is a relative frequency table that summarizes data on the most common types of spam:
(a) What percent of spam would fall in the 鈥淥ther鈥� category?
(b) Make a bar graph to display the data. Describe what you see.
(c) Would it be appropriate to make a pie chart of these data? Explain.
Birthrates in Africa One of the important factors in determining population growth rates is the birthrate per 1000 individuals in a population. The dotplot shows the birthrates per 1000 individuals (rounded to the nearest whole number) for 54 African nations.
(a) Find the median.
(b) Without doing any calculations, explain how the mean and median compare.
Watch that caffeine! The U.S. Food and Drug Adminis tration (USFDA) limits the amount of caffeine in a 12-ounce can of carbonated beverage to 72 milligrams. That translates to a maximum of 48 milligrams of caffeine per 8-ounce serving. Data on the caffeine content of popular soft drinks (in milligrams per 8-ounce serving) are displayed in the stemplot.
Part (a). Why did we split stems?
Part (b). Give an appropriate key for this graph.
Part (c). Describe the shape of the distribution. Are there any outliers?
Hotels (Introduction) A high school lacrosse team is planning to go to Buffalo for a three-day tournament. The tournament鈥檚 sponsor provides a list of available hotels, along with some information about each hotel. The following table displays data about hotel options. Identify the individuals and variables in this data set. Classify each variable as categorical or quantitative.
Healthy cereal? Researchers collected data on 76 brands of cereal at a local supermarket. 27 For each brand, the sugar content (grams per serving) and the shelf in the store on which the cereal was located (1 = bottom, 2 = middle, 3 = top) were recorded. A dotplot of the data is shown here.
Part (a) Is the variability in sugar content of the cereals on the three shelves similar or different? Justify your answer.
Part (b) Critics claim that supermarkets tend to put sugary cereals where kids can see them. Do the data from this study support this claim? Justify your answer. (Note that Shelf 2 is at about eye level for kids in most supermarkets.)
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