Textbook Question
"Identify the population and the sample. Describe the sample data set.
To gather information about starting salaries at companies listed in the Standard & Poor’s 500, a researcher contacts 74 of the 500 companies."
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Ch. 1 - Introduction to Statistics
Larson8th EditionElementary Statistics: Picturing the WorldISBN: 9780137493470
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Table of contents
- Ch. 1 - Introduction to Statistics87
- Ch. 2 - Descriptive Statistics176
- Ch. 3 - Probability184
- Ch. 4 - Discrete Probability Distributions102
- Ch. 5 - Normal Probability Distributions183
- Ch. 6 - Confidence Intervals154
- Ch. 7 - Hypothesis Testing with One Sample165
- Ch. 8 - Hypothesis Testing with Two Samples134
- Ch. 9 - Correlation and Regression87
- Ch. 10 - Chi-Square Tests and the F-Distribution87
Larson8th EditionElementary Statistics: Picturing the WorldISBN: 9780137493470Not the one you use?Change textbook
Chapter 1, Problem 1.3.6
Determine whether the statement is true or false. If it is false, rewrite it as a true statement.
A double-blind experiment is used to increase the placebo effect.
Verified step by step guidance1
Understand the concept of a double-blind experiment: A double-blind experiment is a study design where neither the participants nor the researchers know which group (control or experimental) the participants belong to. This is done to eliminate bias in the results.
Understand the placebo effect: The placebo effect occurs when participants experience a perceived improvement in their condition due to their belief in the treatment, even if the treatment is inactive (a placebo).
Analyze the statement: The statement claims that a double-blind experiment is used to increase the placebo effect. This is incorrect because the purpose of a double-blind experiment is not to increase the placebo effect but to minimize bias and ensure that the placebo effect does not influence the study's results.
Rewrite the statement as a true statement: A double-blind experiment is used to reduce bias and ensure that the results of the study are not influenced by the placebo effect or the researchers' expectations.
Conclude: The statement is false, and the corrected version clarifies the actual purpose of a double-blind experiment.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Double-Blind Experiment
A double-blind experiment is a research design where neither the participants nor the experimenters know who is receiving a particular treatment. This method helps eliminate bias in the results, ensuring that any observed effects are due to the treatment itself rather than expectations or psychological influences from either party.
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Placebo Effect
The placebo effect refers to the phenomenon where patients experience real changes in their health after receiving a treatment that has no therapeutic effect, often due to their expectations or beliefs about the treatment. This effect highlights the importance of psychological factors in medical outcomes and is a critical consideration in clinical trials.
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Purpose of Double-Blind Design
The primary purpose of a double-blind design is to reduce bias and increase the validity of the results. By preventing both participants and researchers from knowing who receives the treatment or placebo, the study can more accurately assess the true efficacy of the treatment, rather than the influence of expectations or biases.
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Related Practice
Textbook Question
Determine the level of measurement of the data listed on the horizontal and vertical axes in the figure.
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Textbook Question
Determine whether the number describes a population parameter or a sample statistic. Explain your reasoning.
In January 2021, 54% of the governors of the 50 states in the United States were Republicans. (Source: National Governors Association)
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Textbook Question
Determine whether the data set is a population or a sample. Explain your reasoning.
The number of guests in each room of a hotel
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Textbook Question
Determine whether the number describes a population parameter or a sample statistic. Explain your reasoning.
A survey of 919 college board members found that 89% think that their institution is a good place for members of racial and ethnic minorities. (Source: Association of Governing Boards of Universities and Colleges)
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Textbook Question
Determine whether the data are qualitative or quantitative. Explain your reasoning.
Nationalities of passengers on a plane
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