Domanda del libro di testo
E-Cigarette Survey In a survey of 36,000 adults, 3.7% said that they regularly use E-cigarettes (based on data from the National Center for Health Statistics)
b. Is the value of 3.7% a statistic or parameter?
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Ch. 1 - Introduction to Statistics
Triola14th EditionElementary StatisticsISBN: 9780137366446
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TOC.tableOfContents
- Ch. 1 - Introduction to Statistics88
- Ch. 2 - Exploring Data with Tables and Graphs70
- Ch. 3 - Describing, Exploring, and Comparing Data66
- Ch. 4 - Probability112
- Ch. 5 - Discrete Probability Distributions109
- Ch. 6 - Normal Probability Distributions122
- Ch. 7 - Estimating Parameters and Determining Sample Sizes107
- Ch. 8 - Hypothesis Testing75
- Ch. 9 - Inferences from Two Samples94
- Ch. 10 - Correlation and Regression80
- Ch. 11 - Goodness-of-Fit and Contingency Tables29
- Ch. 12 - Analysis of Variance42
Triola14th EditionElementary StatisticsISBN: 9780137366446Non è quello che usi tu?Cambia libro di testo
Capitolo 1, Problema 1.5
In Exercises 5–8, determine whether the given source has the potential to create a bias in a statistical study.
AAA The American Automobile Association (AAA) is a not-for-profit federation of motor clubs that provides automotive and travel services. AAA conducts a survey of its members about their use of public transportation versus private automobiles.
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Identify the source of the data: In this case, the source is the American Automobile Association (AAA), which is a federation of motor clubs.
Consider the target population: The survey is conducted among AAA members, who are likely to be automobile owners or enthusiasts.
Evaluate the survey topic: The survey asks about the use of public transportation versus private automobiles.
Analyze potential bias: Since AAA members are more likely to own and use private automobiles, their responses may not accurately represent the general population's use of public transportation.
Conclude on bias potential: The source has the potential to create bias because the surveyed group (AAA members) may have a predisposition towards favoring private automobile use over public transportation.
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Bias in Statistical Studies
Bias in statistical studies refers to systematic errors that can lead to incorrect conclusions. It occurs when certain groups are overrepresented or underrepresented in the sample, leading to results that do not accurately reflect the population. Identifying potential sources of bias is crucial to ensure the validity and reliability of study findings.
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05:53
Parameters vs. Statistics
Sampling Method
The sampling method is the process used to select individuals from the population to participate in a study. A biased sampling method can lead to skewed results if the sample is not representative of the population. In the context of the AAA survey, the sample consists of AAA members, which may not represent the general population's views on public transportation versus private automobiles.
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05:11Sampling Distribution of Sample Proportion
Survey Design
Survey design involves the structure and phrasing of questions, which can influence respondents' answers and potentially introduce bias. Leading questions or those that assume certain behaviors can skew results. In the AAA survey, the design should be scrutinized to ensure questions are neutral and do not favor private automobile use, given the organization's focus.
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03:06Intro to Random Variables & Probability Distributions Example 1
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Domanda del libro di testo
In Exercises 9–20, identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.
Cormorant Density Cormorant bird population densities were studied by using the “line transect method” with aircraft observers flying along the shoreline of Lake Huron and collecting sample data at intervals of every 20 km (based on data from Journal of Great Lakes Research).
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Domanda del libro di testo
In Exercises 37–44, answer the given questions, which are related to percentages.
Workplace Attire In a survey conducted by Opinion Research Corporation, 1000 adults were asked to identify “what is inappropriate in the workplace.” Of the 1000 subjects, 70% said that miniskirts were not appropriate in the workplace.
b. Among the 1000 respondents, 550 said that shorts are unacceptable in the workplace. What percentage of respondents said that shorts are unacceptable in the workplace?
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Domanda del libro di testo
In Exercises 13–20, determine whether the data are from a discrete or continuous data set.
Fraud Detection While monitoring Internet traffic in order to detect fraudulent activity, a researcher records the interarrival times (sec) between incoming Internet queries.
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Domanda del libro di testo
In Exercises 33–36, identify which of these designs is most appropriate for the given experiment: completely randomized design, randomized block design, or matched pairs design.
Lunesta Lunesta is a drug designed to treat insomnia. In a clinical trial of Lunesta, amounts of sleep each night are measured before and after subjects have been treated with the drug.
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Domanda del libro di testo
In Exercises 21–28, determine which of the four levels of measurement (nominal, ordinal, interval, ratio) best describes the given data.
Areas of States A data set consists of the areas of each of the 50 United States.
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