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Chapter 1: Q 3.1. (page 64)
The heights (in inches) of the five starters on a basketball team are . Find the interpretation of mean.
The interpretation of the mean is.
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Angry people and heart disease People who get angry easily tend to have more heart disease. That’s the conclusion of a study that followed a random sample of people from three locations for about four years. All subjects were free of heart disease at the beginning of the study. The subjects took the Spiel burger Trait Anger Scale test, which measures how prone a person is to sudden anger. Here are data for the people in the sample who had normal blood pressure. CHD stands for “coronary heart disease. ”This includes people who had heart attacks and those who needed medical treatment for heart disease.
Do these data support the study’s conclusion about the relationship between anger and heart disease? Follow the four-step process.
The audience for movies Here are data on the percent of people in several age groups who attended a movie in the past months:
(a) Display these data in a bar graph. Describe what you see.
(b) Would it be correct to make a pie chart of these data? Why or why not?
(c) A movie studio wants to know what percent of the total audience for movies is to years old. Explain why these data do not answer this question.
| Age group | Movie attendence |
| 18 to 24 years | 83% |
| 25 to 34 years | 73% |
| 35 to 44 years | 68% |
| 45 to 54 years | 60% |
| 55 to 64 years | 47% |
| 65 to 74 years | 32% |
| 75 to and over | 20% |
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?
Snowmobiles in the park Yellowstone National Park surveyed a random sample of winter visitors to the park. They asked each person whether they owned, rented, or had never used a snowmobile. Respondents were also asked whether they belonged to an environmental organization (like the Sierra Club). The two-way table summarizes the survey responses.
Do these data provide convincing evidence of an association between environmental club membership and snowmobile use for the population of visitors to Yellowstone National Park? Follow the four-step process.
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.
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