Questions and Answers of Elementary Statistics Picturing

What is the difference between class limits and class boundaries?
Why should the number of classes in a frequency distribution be between 5 and 20?
What are some benefits of representing data sets using frequency distributions? What are some benefits of using graphs of frequency distributions?
Researchers surveyed 19,183 U.S. physicians, asking for the information below. Location (region of the U.S.) income (dollars) employment status (private practice or an employee) benefits
Determine whether the survey question is biased. If the question is biased, suggest a better wording.(a) How many hours of sleep do you get on a normal night?(b) Do you agree that the town’s ban on
Determine whether the data are qualitative or quantitative, and determine the level of measurement of the data set. Explain your reasoning.(a) The numbers of employees at fast-food restaurants in a
Identify the sampling technique used, and discuss potential sources of bias (if any). Explain. (a) Chosen at random, 200 male and 200 female high school students are asked about their plans
Determine whether each number describes a population parameter or a sample statistic. Explain.(a) A survey of 1003 U.S. adults ages 18 years and older found that 72% own a smartphone. (b) In a
Determine whether you would take a census or use a sampling. If you would use a sampling, determine which sampling technique you would use. Explain. (a) The most popular type of investment among
A journalist interviews 154 people waiting at an airport baggage claim and asks them how safe they feel during air travel.Identify the sampling technique used, and discuss potential sources of bias
Twenty-five students are randomly selected from each grade level at a high school and surveyed about their study habits.Identify the sampling technique used, and discuss potential sources of bias (if
Law enforcement officials stop and check the driver of every third vehicle for blood alcohol content.Identify the sampling technique used, and discuss potential sources of bias (if any). Explain.
A study in a town in northwest Ethiopia designed to determine prevalence and predictors of depression among pregnant women randomly selects four districts of the town, then interviews all pregnant
A student asks 18 friends to participate in a psychology experiment.Identify the sampling technique used, and discuss potential sources of bias (if any). Explain.
Using random digit dialing, researchers ask 1201 U.S. adults whether enough is being done to fight opioid addiction.Identify the sampling technique used, and discuss potential sources of bias (if
Explain how you could design an experiment so that it uses a completely randomized design.Two hundred students volunteer for an experiment to test the effects of sleep deprivation on memory recall.
Explain how you could design an experiment so that it uses a randomized block design.Two hundred students volunteer for an experiment to test the effects of sleep deprivation on memory recall. The
Researchers conduct a study to determine the effect of coffee consumption on the development of multiple sclerosis. To perform the study, researchers asked 4408 adults in Sweden and 2331 adults in
Researchers conduct a study to determine whether a drug used to treat hypertension in patients with obstructive sleep apnea works better when taken in the morning or in the evening. To perform the
The total compensations (in millions of dollars) of the ten highest-paid CEOs at U.S. public companies are listed. 94.6 56.4 54.1 53.2
The vehicle size classes for a sample of sedans are listed.Minicompact Subcompact Compact Mid-size LargeDetermine
The daily high temperatures (in degrees Fahrenheit) for Sacramento, California, for a week in September are listed. 90 80 76 84
The marital statuses of all engineers at an electric utility.Determine whether the data are qualitative or quantitative. Explain your reasoning.
The revenues of the companies on the Fortune 500 list.Determine whether the data are qualitative or quantitative. Explain your reasoning.
The zip codes of a sample of 200 customers at a sporting goods store.Determine whether the data are qualitative or quantitative. Explain your reasoning.
The ages of a sample of 350 employees of a software company.Determine whether the data are qualitative or quantitative. Explain your reasoning.
Thirty percent of a sample of 521 U.S. workers say that they worry about having their benefits reduced.Determine whether the number describes a population parameter or a sample statistic. Explain
In a study of math majors at a university, 10 students minored in physics.Determine whether the number describes a population parameter or a sample statistic. Explain your reasoning.
In a survey of 1000 likely U.S. voters, 29% trust media fact-checking of candidates’ comments.Determine whether the number describes a population parameter or a sample statistic. Explain your
In 2016, the National Science Foundation announced $22.7 million in infrastructure-strengthening investments.Determine whether the number describes a population parameter or a sample statistic.
A survey of 1601 U.S. children and adults ages 16 years and older found that 48% have visited a public library or a bookmobile over a recent span of 12 months.Identify the population and the sample.
A survey of 2223 U.S. adults found that 62% would encourage a child to pursue a career as a video game developer or designer.Identify the population and the sample. Describe the sample data set.
Eighty-three doctors working in the St. Louis area were surveyed concerning their opinions of health care reform.Identify the population and the sample. Describe the sample data set.
A survey of 4787 U.S. adults found that 15% use ride-hailing applications.Identify the population and the sample. Describe the sample data set.

Showing 2900 - 3000 of 2934