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Chapter 1: Q. 7 (page 8)
The individuals in this data set are
(a) households. (d) 120 variables.
(b) people. (e) columns.
(c) adults.
An individual can be classified into people, animals and things. They have also more than one variable.
The data also contain various age and people.
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Basketball playoffs Here are the scores of the games played in the California Division I-AAA high school basketball playoffs
On the same day, the final scores of games in the Division
V-AA were
(a) Construct a back-to-back stem plot to compare the points scored by the teams in the Division I-AAA playoffs and the teams in the Division V-AA
playoffs.
(b) Write a few sentences comparing the two distributions.
El Niño and the monsoon It appears that El Niño, the periodic warming of the Pacific Ocean west of South America, affects the monsoon rains that are essential for agriculture in India. Here are the monsoon rains (in millimeters) for the strong El Niño years between and
(a) To make a stem plot of these rainfall amounts, round the data to the nearest 10, so that stems are hundreds of millimeters and leaves are tens of millimeters. Make two stem plots, with and without splitting
the stems. Which plot do you prefer?
(b) Describe the shape, center, and spread of the distribution.
(c) The average monsoon rainfall for all years from to is about millimeters. What effect does El Niño appear to have on monsoon rains?
A study among the Pima Indians of Arizona investigated the relationship between a mother’s 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’t forget to label your graph completely. (d) Comment on any clear associations you see.
Which of the distributions shown has a larger standard deviation? Justify your answer.
The National Survey of Adolescent Health interviewed several thousand teens (grades 7 to 12). One question asked was "What do you think are the chances you will be married in the next ten years?" Here is a two-way table of the responses by gender: Your percent from the previous exercise is part of-
(a) the marginal distribution of gender.
(b) the marginal distribution of opinion about marriage.
(c) the conditional distribution of gender among adolescents with a given opinion.
(d) the conditional distribution of opinion among adolescents of a given gender.
(e) the conditional distribution of “Almost certain” among females.
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