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statistics alive

Questions and Answers of Statistics Alive

The data in Table 1.8 are the weights at birth of 30 full-term babies, born at a metropolitan hospital and recorded to the nearest tenth of a pound.7 Construct a stem and leaf plot to display the
Table 1.7 lists the prices (in dollars) of 19 different brands of walking shoes. Use a stem and leaf plot to display the data. Table 1.7 Prices of Walking Shoes 2550 90 70 65 68 75 70 288 787 70 70
In the year 2025, the oldest “baby boomers” (born in 1946) will be 79 years old, and the oldest“Gen Xers” (born in 1965) will be 2 years from Social Security eligibility. How will this affect
The amount of money expended in fiscal year 2016 by the U.S. Department of Defense in various categories is shown in Table 1.5.6 Use both a pie chart and a bar chart to describe the data. Compare the
21. Car Colors The most popular colors for compact and sports cars in a recent year are given in the tableUse an appropriate graph to describe these data. Color Silver Percentage Color Percentage 14
20. Which of the charts is the most effective in describing the data?Diamonds Are Forever! Much of the world’s diamond mining industry is located in Africa, Russia, and Canada.A visual
19. Draw a Pareto chart to describe the various shares of the world’s diamond revenues.Diamonds Are Forever! Much of the world’s diamond mining industry is located in Africa, Russia, and Canada.A
18. Draw a bar chart to describe the various shares of the world’s diamond revenues.Diamonds Are Forever! Much of the world’s diamond mining industry is located in Africa, Russia, and Canada.A
17. Draw a pie chart to describe the various shares of the world’s diamond revenues.Diamonds Are Forever! Much of the world’s diamond mining industry is located in Africa, Russia, and Canada.A
16. Back to Work How long does it take you to adjust to your normal work routine after coming back from vacation? A bar graph with data from a USA Today snapshot is shown here:a. Are all of the
15. How would you describe the changes in the distribution of average daily users during this 7-year period?The social networking site Facebook has grown rapidly in the last 10 years. The following
14. Use a bar chart to describe the distribution of average daily users for the four regions in 2017.The social networking site Facebook has grown rapidly in the last 10 years. The following table
13. Use a bar chart to describe the distribution of average daily users for the four regions in 2010.The social networking site Facebook has grown rapidly in the last 10 years. The following table
12. Use a pie chart to describe the distribution of average daily users for the four regions in 2017.The social networking site Facebook has grown rapidly in the last 10 years. The following table
11. Want to Be President? In an opinion poll conducted by ABC News, nearly 80% of the teens said they were not interested in being the president of the United States.2 When asked “What’s the main
Presidential Popularity After the elections of 2016, a poll was taken to study the approval ratings for past presidents George W. Bush and Barack Obama. The poll, involving 1,009 U.S. adults 18 years
Presidential Popularity After the elections of 2016, a poll was taken to study the approval ratings for past presidents George W. Bush and Barack Obama. The poll, involving 1,009 U.S. adults 18 years
Presidential Popularity After the elections of 2016, a poll was taken to study the approval ratings for past presidents George W. Bush and Barack Obama. The poll, involving 1,009 U.S. adults 18 years
Presidential Popularity After the elections of 2016, a poll was taken to study the approval ratings for past presidents George W. Bush and Barack Obama. The poll, involving 1,009 U.S. adults 18 years
Presidential Popularity After the elections of 2016, a poll was taken to study the approval ratings for past presidents George W. Bush and Barack Obama. The poll, involving 1,009 U.S. adults 18 years
5. Jeans A manufacturer of jeans has plants in California, Arizona, and Texas. Twenty-five pairs of jeans are randomly selected from the computerized database, and the state in which each is produced
4. Groups of People Fifty people are grouped into four categories—A, B, C, and D—and the number of people who fall into each category is shown in the table:a. Construct a pie chart to describe
The data represent different ways to classify a group of 100 students in a statistics class. Construct a bar chart and pie chart to describe each set of data. 3. College Humanities, Arts, & Sciences
The data represent different ways to classify a group of 100 students in a statistics class. Construct a bar chart and pie chart to describe each set of data. 2. Status Frequency Freshman 32
The data represent different ways to classify a group of 100 students in a statistics class. Construct a bar chart and pie chart to describe each set of data. 1. Final Grade Frequency ABCDE 31 36
A snack size bag of peanut M&M’S candies contains 21 candies with the colors listed in Table 1.3. The variable “color” is qualitative, so Table 1.4 lists the six categories along with a tally
In a public education survey, 400 school administrators were asked to rate the quality of education in the United States. Their responses are summarized in Table 1.1. Construct a pie chart and a bar
27. New Teaching Methods A researcher wants to know whether a new way of teaching reading to deaf students is working. She measures a student’s score on a reading test before and after being taught
26. Cancer Survival Times A researcher wants to estimate the survival time of a cancer patient after a course of radiation therapy.a. What is the variable of interest to the researcher?b. Is the
25. Voter Attitudes You are a candidate for your state legislature, and you want to survey voter attitudes about your chances of winning.a. What is the population that is of interest to you and from
24. Past U.S. Presidents A data set gives the ages at death for each of the 38 past presidents of the United States now deceased.a. Is this data set a population or a sample?b. What is the variable
23. Parking on Campus Six vehicles selected from a campus vehicle database are shown in the tablea. What are the experimental units?b. List the variables that are being measured. What types are
22. The income distribution of the top 10% of wage earners in the United States is determined using data from the Internal Revenue Service. determine whether the data collected represents a
21. Twenty animals are put on a new diet and their weight gain over 3 months is recorded. determine whether the data collected represents a population or a sample
20. One thousand citizens were interviewed and their opinions regarding gun control were recorded. determine whether the data collected represents a population or a sample
19. A researcher uses a statewide database to determine the percentage of Michigan drivers who have had an accident in the last 5 years. determine whether the data collected represents a population
18. Yield of wheat (in tonnes) from a one-hectare plot . Are the variables discrete or continuous?
17. Number of brothers and sisters you have . Are the variables discrete or continuous?
16. Cost of a head of lettuce . Are the variables discrete or continuous?
15. Time required to complete a questionnaire . Are the variables discrete or continuous?
14. Number of boating accidents along an 80-kilometer stretch of the Colorado River . Are the variables discrete or continuous?
13. Number of consumers in a poll of 1,000 who consider nutritional labeling on food products to be important . Are the variables discrete or continuous?
12. Number of claims filed with an insurance company during a single day . Are the variables discrete or continuous?
11. Weight of newspapers recycled on a single day . Are the variables discrete or continuous?
10. Population in a certain area of the United States . Are the variables discrete or continuous?
9. State in which a person lives Are the variables qualitative or quantitative?
8. Rating of a newly elected politician (excellent, good, fair, poor) Are the variables qualitative or quantitative?
7. Number of students in a first-grade classroom Are the variables qualitative or quantitative?
6. Amount of time it takes to assemble a simple puzzle Are the variables qualitative or quantitative?
5. Color of a car entering a parking lot Define the experimental units for the variables
4. Number of flowers on an azalea plant Define the experimental units for the variables
3. Age of a cancer patient Define the experimental units for the variables
2. Number of errors on a midterm exam Define the experimental units for the variables
1. Gender of a student Define the experimental units for the variables
Identify each of the following variables as qualitative or quantitative:1. The most frequent use of your microwave oven (reheating, defrosting, warming, other)2. The number of consumers who refuse to
A set of five students is selected from all undergraduates at a large university, and measurements are entered into a spreadsheet as shown in Figure 1.1. Identify the various elements involved in
How would you rate yourself politically 11 = very liberal, 2 = liberal, 3 = slightly liberal, 4 = moderate, 5 = slightly conservative, 6 = conservative, 7 = very conservative2? _____
Do you consider yourself a vegetarian 1y = yes, n = no2? _____
How many times a week, on average, do you read a daily newspaper? _____
How many hours each week, on average, do you participate in sports or have other physical exercise? _____
How many minutes each day, on average, do you watch TV? _____
How many minutes each day, on average, do you spend browsing the Internet? _____
What is the distance (in miles) between your current residence and this class? _____
What is your current college GPA? _____
What was (is) your high school GPA (based on a 4.0 scale)? _____
Aside from class time, how many hours a week, on average, do you expect to spend studying and completing assignments for this course? _____
Do you have a paying job during the school year at which you work on average at least 10 hours a week 1y = yes, n = no2? _____
How much did you spend on your last haircut? _____
What is your gender 1M = Male, F = Female2? _____
What is your height (recorded in inches)? _____
Example 1 describes Allison’s experiment to determine whether a tanning lotion or a tanning studio produced a better tan. Table 15.1 showed the possible rankings for five tans. Table 15.2 showed
How can Allison find a P-value to determine whether one treatment is significantly better than the other?
Once Allison ranked the five tanned participants, how could she summarize the evidence in favor of one treatment over the other?
What conclusions can you make if you take into account both the type of recording and whether it was repeated every five minutes or every ten minutes?
In this experiment, are the sample mean times that callers stayed on hold before hanging up significantly different for the three recording types?
How can you make inferences about the population of all houses in the community, based on the information in the sample?
How can you describe the association between selling price and the other variables?
How can you predict a home’s selling price?
What can we say about the association between these variables in the population?
How well can we predict an athlete’s maximum bench press from knowing the number of 60-pound bench presses that she can perform?
Can you think of a variable that might have a stronger association with happiness than family income?
If there is an association, what is its nature? For example, do people with above-average family income tend to be happier than people with below-average family income?
How can you determine if there is an association between happiness and family income in the population of all adult Americans?
How can we use the information in the data to make an inference about the larger population of all visitors to the website? What are the assumptions we need to make for our inference to be valid?
How can we use data from such experiments to compare two web designs in terms of number of clicks or amount of sales generated?
How can we decide, based on the data, whether the claim is plausible?
How can we use data from such an experiment to summarize the evidence about the claim by the astrologers?
The mean number of hours that Americans watch TV per day?
The proportion of Americans who agree that it is better for everyone involved if the man is the achiever outside the home and the woman takes care of the home and family?
j The proportion of Americans who are willing to pay higher prices to protect the environment?
How does the sample size influence our analyses? For instance, could we sample 100 voters instead of 3889 voters and make an accurate inference about the population percentage voting for Brown?On the
How close can we expect a sample percentage to be to the population percentage? For instance, if 53.1% of 3889 sampled voters supported Brown, how close to 53.1% is the percentage of the entire
Many playoff and championship games in professional sports such as basketball, baseball, or hockey are decided by a best of seven series, in which the team that is the first to get four victories
Suppose a diagnostic test says that a person has recently used drugs. How likely is it that the person truly did use drugs?
Given that a person recently used drugs, how can we estimate the likelihood that a diagnostic test will correctly predict drug use?
What types of biases or lurking variables might exist?
How can you design the study to be efficient?
Is the study ethically feasible?
Does the study design establish a causal link between cell phone use and potential health risks?
Why do results of different medical studies sometimes disagree?

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