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Chapter 1: Q 84. (page 70)
House prices: The mean and median selling prices of existing single-family homes sold in November were and . Which of these numbers is the mean and which is the median? Explain how you know.
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Use the data in the two-way table on page 12 to calculate the marginal distribution (in percents) of gender.
Smoking by students and parents Here is data from a survey conducted at eight high schools on smoking among students and their parents:
(a)How many students are described in the two-way table? What per cent of these students smoke?
(b) Give the marginal distribution of parents’ smoking behaviour, both in counts and in percentages.
Income and education level Each March, the Bureau of Labor Statistics compiles an Annual Demographic Supplement to its monthly Current Population Survey.44 Data on about individuals between the ages of data-custom-editor="chemistry" who were employed full-time were collected in one of these surveys. The boxplots below compare the distributions of income for people with five levels of education. This figure is a variation of the boxplot idea: because large data sets often contain very extreme observations, we omitted the individuals in each category with the top and bottom of incomes. Write a brief description of how the distribution of income changes with the highest level of education reached. Give specifics from the graphs to support your statements.
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 are the scores on the Survey of Study Habits and Attitudes (SSHA) for 18 first-year college women:
and for 20 first-year college men:
Do these data support the belief that women have better study habits and attitudes toward learning than men? (Note that high scores indicate good study habits and attitudes toward learning.) Follow the four-step process.
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