Bundle: Introduction to Statistics and Data Analysis, 5th + WebAssign Printed Access Card: Peck/Olsen/Devore. 5th Edition, Single-Term
5th Edition
ISBN: 9781305620711
Author: Roxy Peck, Chris Olsen, Jay L. Devore
Publisher: Cengage Learning
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Textbook Question
Chapter 2.4, Problem 49E
Explain why blinding is a reasonable strategy in many experiments.
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Explain the difference between an observational study and an experiment. Give the description of a real-word example of each of these types of studies. Explain the purpose of blinding (single or double) in experimental studies using an example.
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What are the requirements for an experiment to be able to show that changes in one variable cause changes in another?
Chapter 2 Solutions
Bundle: Introduction to Statistics and Data Analysis, 5th + WebAssign Printed Access Card: Peck/Olsen/Devore. 5th Edition, Single-Term
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- What are the advantages of conducting experiments with more than two groups or conditions?arrow_forwardExperiments are the next most convenient technique for gathering information on many variables. True or Falsearrow_forwardDoes the example represent an observational study or an experiment? Car accident data is obtained from the Ohio database. It is found that more accidents happened at night.arrow_forward
- I don't understand the whole concept of randomized experiments. What does it mean if the cases are not selected randomly but are assigned randomly to groups? How to determine causality? When do we generalize to the whole population?arrow_forwardExplain the difference between the one-way fixed effects model and the one-way random effects model.arrow_forwardWhenever a two-factor experiment results in a significant interaction, you should be cautious about interpreting the main effects because an interaction can distort, conceal, or exaggerate the main effects of the individual factors. True Falsearrow_forward
- Explain why blinding is a reasonable strategy in many experiments. O Blinding helps researchers study the control effect better, since knowing if you are in the control group can have a mental effect on results. O Blinding can help solve the doubling issue in research, where people feel they need to match those around them in response/measurement. O Blinding keeps people and researchers from deliberately skewing the effects of the experiment, or to highlight a placebo effect. O Blinding can help solve the singling issue in research, where people feel they need to be unique from those around them in response/measurement.arrow_forwardOne disadvantage of a repeated measures design is the possibility of order effects. Which of the following statements is false? O Order effects are often due to the treatment itself. O Order effects can bias the results of an experiment. O Order effects can be lessened by applying counterbalancing to the experimental design. O An order effect is an increase or decrease in the response to each subsequent treatment due to an increase in learning, fatigue, or boredom.arrow_forwardA large study used records from Canada’s national health care system to compare the effectiveness of two ways to treat prostate disease. The two treatments are traditional surgery and a new method that does not require surgery. The records described many patients whose doctors had chosen one or the other method. The study found that patients treated by the new method were more likely to die within eight years. Explain why this is an observational study and not an experiment.arrow_forward
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