Introduction To Statistics And Data Analysis
6th Edition
ISBN: 9781337793612
Author: PECK, Roxy.
Publisher: Cengage Learning,
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Textbook Question
Chapter 2.4, Problem 52E
Explain why some studies include both a control group and a placebo treatment. What additional comparisons are possible if both a control group and a placebo group are included?
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Explain why some studies include both a control group and a placebo treatment. What additional comparisons are possible if both a control group a placebo group are included?
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Explain the difference between a no-treatment control group and a placebo control group. Why are studies that compare a treatment condition to a placebo control group often associated with higher internal validity compared to studies with a no-treatment control?
Chapter 2 Solutions
Introduction To Statistics And Data Analysis
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.Similar questions
- What is an experiment?arrow_forwardA researcher is testing the effect of one independent variable using three treatment conditions. She compares three group means where there are different people in each group. It is best for her to use which type of statistical analysis?arrow_forwardA research study examining differences in the effectiveness of three treatment conditions in combatting anxiety has three levels. True Falsearrow_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_forwardResearchers have observed that high school students who watched educational television programs as young children tend to have higher grades than their peers who did not watch educational television. Is this an observational study or a controlled experiment? Explain why.arrow_forwardDescribe the different ways that within-subjects designs are used to compare two or more treatment conditions, identify the statistical techniques that are appropriate for each application, and explain the strengths and weaknesses of each application.arrow_forward
- Distinguish between observational and experimental types of studies?arrow_forwardInvestigators are interested in the relationship between sleep apnea and Alzheimer's disease. In order to more thoroughly understand the relationship, these investigators decide to recruit 50 participants with Alzheimer's and 50 participants without Alzheimer's, and look at their history of sleep apnea. 1) What type of study design is this? Explain your answer in details. 2) What are the explanatory (independent or risk factor) and response (dependent, outcome or disease) variables? Explain your answer.arrow_forwardExplain the Potential Outcomes and the Average Causal Effect of using randomized controlled experiments?arrow_forward
- A researcher was interested in studying how gender (male vs. female) and age (younger vs. older) affect performance in a simple reaction time task. Which statistical test should be used to assess the effects of gender and age on reaction?arrow_forwardIt would not be ethical to assign one group of children to smoke in order to study the effect. so, in lieu of this type of direct experimentation other forms of evidence are commonly accepted. Describe two of the common types of evidence that can be used to establish a cause-effect relationship when direct experimentation is not possible.arrow_forwardWhat benefit does conducting an experiment to prove that free coffee causes more frequent shoe purchases have beyond determining cause and effect? An experiment allows the researcher to include as many variables as possible in the experiment . An experiment allows the researcher to cross -check that their observations are correct . This type of study allows a researcher to employ a case study research design . An experiment allows the researcher to eliminate the effects of confounding variablesarrow_forward
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