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Chapter 1: Q. 10 (page 78)
Mercury in Tuna
There appears to be a difference.
Given
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About million first-year students enroll in colleges and universities each year. What do they plan to study? The pie chart displays data on the percent of first-year students who plan to major in several discipline areas. About what percent of first-year students plan to major in business? In social science?
You record the age, marital status, and earned income of a sample of 1463 women. The number and type of variables you have recorded is
(a) 3 quantitative, 0 categorical
(b) 4 quantitative, 0 categorical
(c) 3 quantitative, 1 categorical
(d) 2 quantitative, 1 categorical
(e) 2 quantitative, 2 categorical
The IQR Is the interquartile range a resistant measure of spread? Give an example of a small data set that supports your answer.
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.
Here, once again, is the stem plot of travel times to work for randomly selected New Yorkers. Earlier, we found that the median was minutes.
Based only on the stem plot, would you expect the mean travel time to be less than, about the same as, or larger than the median? Why?
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