Chapter 1: Q 1.3. (page 31)
The Fathom dot-plot displays data on the number of siblings reported by each student in a statistics class.

Describe the spread of the distribution.
Short Answer
The distribution is not approximately normally distributed
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Chapter 1: Q 1.3. (page 31)
The Fathom dot-plot displays data on the number of siblings reported by each student in a statistics class.

Describe the spread of the distribution.
The distribution is not approximately normally distributed
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The National Survey of Adolescent Health interviewed several thousand teens (grades to ). One question asked was 鈥淲hat do you think are the chances you will be married in the next ten years?鈥 Here is a two-way table of the responses by gender:

What percent of females thought that they were almost certain to be married in the next ten years?
(a) About (c) About (e) About
(b) About (d) About
Angry people and heart disease People who get angry easily tend to have more heart disease. That鈥檚 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 鈥渃oronary heart disease. 鈥漈his includes people who had heart attacks and those who needed medical treatment for heart disease.

Do these data support the study鈥檚 conclusion about the relationship between anger and heart disease? Follow the four-step process.
The individuals in this data set are
(a) households. (d) 120 variables.
(b) people. (e) columns.
(c) adults.
Researchers from Amherst College studied the relationship between varieties of the tropical flower Heliconia on the island of Dominica and the different species of hummingbirds that fertilize the flowers. Over time, the researchers believe, the lengths of the flowers and the forms of the hummingbirds鈥 beaks have evolved to match each other. If that is true, flower varieties fertilized by different hummingbird species should have distinct distributions of length. The table below gives length measurements (in millimeters) for samples of three varieties of Heliconia, each fertilized by a different species of hummingbird. Do these data support the researchers鈥 belief? Follow the four-step process

A study among the Pima Indians of Arizona investigated the relationship between a mother鈥檚 diabetic status and the appearance of birth defects in her children. The results appear in the two-way table below.

(a) Fill in the row and column totals in the margins of the table. (b) Compute (in percents) the conditional distributions of birth defects for each diabetic status. (c) Display the conditional distributions in a graph. Don鈥檛 forget to label your graph completely. (d) Comment on any clear associations you see.
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