Chapter 1: Q. 78. (page 53)
Die rolls Imagine rolling a fair, six-sided die 60 times. Draw a plausible graph of the distribution of die rolls. Should you use a bar graph or a histogram to display the data?
Chapter 1: Q. 78. (page 53)
Die rolls Imagine rolling a fair, six-sided die 60 times. Draw a plausible graph of the distribution of die rolls. Should you use a bar graph or a histogram to display the data?
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Get started for freeCarbon dioxide emissions Burning fuels in power plants and motor vehicles emits carbon dioxide (CO2 ), which contributes to global warming. The table displays CO2 emissions per person from countries with populations of at least 20 million. 30
Part (a). Make a histogram of the data using intervals of width 2, starting at 0.
Part (b). Describe the shape of the distribution. Which countries appear to be outliers
Social media You are preparing to study the social media habits of high school students. Describe two categorical variables and two quantitative variables that you might record for each student.
Protecting woodWhat measures can be taken, especially when restoring historic wooden buildings, to help wood surfaces resist weathering? In a study of this question, researchers prepared wooden panels and then exposed them to the weather. Some of the variables recorded were type of wood (yellow poplar, pine, cedar); type of water repellent (solvent based, water-based); paint thickness (millimeters); paint color (white, gray, light blue); weathering time (months). Classify each variable as categorical or quantitative.
Mean salary? Last year a small accounting firm paid each of its five clerks \(32,000, two junior accountants \)60,000 each, and the firmโs owner $280,000.
(a) What is the mean salary paid at this firm? How many of the employees earn less than the mean? What is the median salary?
(b) Write a sentence to describe how an unethical recruiter could use statistics to mislead prospective employees.
Women and children first? Hereโs another table that summarizes data on survival status by gender and class of travel on the Titanic:
(a) Find the distributions of survival status for males and for females within each class of travel. Did women survive the disaster at higher rates than men? Explain.
(b) In an earlier example, we noted that survival status is associated with class of travel. First-class passengers had the highest survival rate, while third-class passengers had the lowest survival rate. Does this same relationship hold for both males and females in all three classes of travel? Explain.
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