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Chapter 1: Q 70. (page 49)
One of the following scores was omitted from the stem plot below:
The missing number is
The correct option is (d)
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C-sections Do male doctors perform more cesarean sections (C-sections) than female doctors? A study in Switzerland examined the number of cesarean sections (surgical deliveries of babies) performed in a . Section Describing Quantitative Data with Numbers year by samples of male and female doctors. Here are summary statistics for the two distributions:
(a) Based on the computer output, which distribution would you guess has a more symmetrical shape? Explain.
(b) Explain how the IQRs of these two distributions can be so similar even though the standard deviations are quite different.
(c) Does it appear that males perform more C-sections? Justify your answer
Use the data in the two-way table on page 12 to calculate the marginal distribution (in percents) of gender.
Birth days Births are not evenly distributed across
the days of the week. Here are the average numbers
of babies born on each day of the week in the United
States in a recent year.
(a) Present these data in a well-labelled bar graph.
Would it also be correct to make a pie chart?
(b) Suggest some possible reasons why there are
fewer births on weekends.
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.
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.
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