Please answer all or don\'t answer!! Question 21 A design in which different sub

Question

Please answer all or don't answer!!

Question 21

A design in which different subjects are randomly assigned to the various groups in the experiment is a_____ design.

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Question 22

Dr. Sabrina M. Gotrocks is conducting an experiment on the effects of alcohol on memory; participants are first tested after drinking a nonalcoholic beverage and then again after drinking an alcoholic beverage. This is an example of a _____ design.

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Question 23

A way of reducing error variance is to _____.

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Question 24

An advantage of the matched groups design over the random assignment is that the matched groups design _____.

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Question 25

A disadvantage of a within-subjects design is that _____.

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Question 26

Among the sources of carryover in within-subjects designs are _____.

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Question 27

_____ involves assigning the various treatments of the experiment in a different order for different subjects.

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Question 28

A design in which every possible order of treatments is represented once is the _____.

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Question 29

A factorial design always has more than one _____.

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Question 30

Confounding is best defined as _____.

Explanation / Answer

21. Single subject design

In this design, the sample is drawn from the population and each element of the samples or participants are then randomly assigned to different treatment conditions,

22.within subjects

This is because the same participants are being tested on two different treatment conditions to establish difference of significance between alcohol and other beverages ‘within’ the same persons.

23. By enhancing the effectiveness of the independent variable

Error Variance is uncontrollable variance due to the factors such as boredom, mood, guessing, inattention which may lead to greater variability within the sample. By dividing the experimental conditions into several "blocks", the researcher can localize error variance. in each block the within-group variability will become smaller

24. It allows control over subject variables

Matching participants as close as possible on measurable traits may help control for individual differences affecting the results.

25. Each subject must spend more time in the experiment and become fatigued.

Within subjects design lead to ‘carryover effects’ in the form of fatigue and practices die to involvement of the same participants in the two treatment conditions.

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