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Chapter 1: Q 3.2. (page 64)
The heights (in inches) of the five starters on a basketball team are
Make a table that shows, for each value, its deviation from the mean and its squared deviation from the mean.
The deviation from the calculated mean isand the square deviation of the mean is .
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The histogram below shows the distribution of the per cent of women aged 15 and over who have never married in each of the 50 states and the District of Columbia.
The center of this distribution is in the interval
(a) to
(b) to
(c)
(d) to
(e)to
The mean salary of all female workers is The mean salary of all male workers is What must be true about the mean salary of all workers?
(a) It must be
(b) It must be larger than the median salary.
(c) It could be any number between and
(d) It must be larger than
(e) It cannot be larger than
Shopping spree A marketing consultant observed 50 consecutive shoppers at a supermarket. One variable of interest was how much each shopper spent in the store. Here are the data (in dollars), arranged in
increasing order:
(a) Round each amount to the nearest dollar. Then make a stem plot using tens of dollars as the stems and dollars as the leaves.
(b) Make another stem plot of the data by splitting stems. Which of the plots shows the shape of the distribution better?
(c) Write a few sentences describing the amount of money spent by shoppers at this supermarket.
Attitudes toward recycled products Exercise gives data on the opinions of people who have and have not bought coffee filters made from recycled paper.
To see the relationship between opinion and experience with the product, find the conditional distributions of opinion (the response variable) for buyers and nonbuyers. What do you conclude?
You are interested in how much time students spend on the Internet each day. Here are data on the time spent on the Internet (in minutes) for a particular day reported by a random sample of 30 students at a large high school
(a) Construct a histogram of these data. (b) Are there any outliers? Justify your answer. (c) Would it be better to use the mean and standard deviation or the median and )12 to describe the center and spread of this distribution? Why?
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