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Chapter 1: Q 2.2. (page 61)
The roster of the Dallas Cowboys professional football team included offensive linemen. Their weights (in pounds) were
Calculate the IQR. Interpret this value in the context
The IQR is 15
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This is a standard deviation contest. You must choose four numbers from the whole numbers to , with repeats allowed.
(a) Choose four numbers that have the smallest possible standard deviation.
(b) Choose four numbers that have the largest possible standard deviation.
(c) Is more than one choice possible in either (a) or (b)? Explain.
At the Census Bureau Web site, you can view detailed data collected by the American Community Survey. The table below includes data for 10 people chosen at random from the more than one million people in households contacted by the survey. 鈥淪chool鈥� gives the highest level of education completed.
This data set contains
(a) 7 variables, 2 of which are categorical.
(b) 7 variables, 1 of which is categorical.
(c) 6 variables, 2 of which are categorical.
(d) 6 variables, 1 of which is categorical.
(e) None of these.
The chapter-opening Case Study described research by Teresa Amabile investigating whether external rewards would promote creativity in children鈥檚 artwork. Dr. Amabile conducted another study involving college students, who were divided into two groups using a chance process (like drawing names from a hat). The students in one group were given a list of statements about external reasons
(E) for writing, such as public recognition, making money, or pleasing their parents. Students in the other group were given a list of statements about internal reasons (I) for writing, such as expressing yourself and
enjoying playing with words. Both groups were then instructed to write a poem about laughter.
Each student鈥檚 poem was rated separately by different poets using a creativity scale. The poets鈥� ratings of each student鈥檚 poem were averaged to obtain an overall creativity score.
A dot-plot of the two groups鈥� creativity scores is shown below. Compare the two distributions. What do you conclude about whether external rewards promote creativity?
Population pyramids A population pyramid is a helpful graph for examining the distribution of a country鈥檚 population. Here is a population pyramid for Vietnam in the year . Describe what the graph tells you about Vietnam鈥檚 population that year. Be specific.
Attitudes toward recycled products Recycling is supposed to save resources. Some people think recycled products are lower in quality than other products, a fact that makes recycling less practical. People who actually use a recycled product may have different opinions from those who don鈥檛 use it. Here are data on attitudes toward coffee filters made of recycled paper among people who do and don鈥檛 buy these filters:
(a)How many people does this table describe? How many of these were buyers of coffee filters made of recycled paper?
(b)Give the marginal distribution of opinion about the quality of recycled filters. What percent of consumers think the quality of the recycled product is the same or higher than the quality of other filters?
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