REPORTING AND THESIS WRITING
DETERMINING EXPERIMENTAL AND SAMPLE DESIGNS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Write the name of each student in the senior class on a slip of paper and put the papers in a container. Then randomly select 40 slips of paper from the container.
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If there are 20 different students per class, select two classes at random and include those students in your sample.
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From a list of all seniors, select one of the first 10 names at random. Then, select every
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Select the first 40 seniors to pass through the cafeteria door at lunch.
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Randomly select 10 students from each of the four senior calculus classes.
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Detailed explanation-1: -The components of experimental design are control, independent variable and dependent variable, constant variables, random assignment and manipulation. These are the components that also help you define if the experiment is valid.
Detailed explanation-2: -Blocking is used to remove the effects of a few of the most important nuisance variables. Randomization is then used to reduce the contaminating effects of the remaining nuisance variables. For important nuisance variables, blocking will yield higher significance in the variables of interest than randomizing.
Detailed explanation-3: -Which of the following distinguishes an observational study from a randomized experiment? In an observational study treatments are not randomly assigned, whereas in a randomized experiment treatments are randomly assigned.