A study is conducted to determine whether people learn better with spaced or massed practice. Subjects volunteer from an introductory psychology class. The first 10 subjects who volunteer are assigned to the massed-practice condition; the next 10 are assigned to the spaced-practice condition. Discuss the consequences and seriousness of each of the following two kinds of non-random sampling:(1) Subjects are not randomly sampled from some specified population. (2) Subjects are not randomly assigned to conditions.  In general, which type of non-random sampling is more serious and why?

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Asked Jan 10, 2020
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  1.  A study is conducted to determine whether people learn better with spaced or massed practice. Subjects volunteer from an introductory psychology class. The first 10 subjects who volunteer are assigned to the massed-practice condition; the next 10 are assigned to the spaced-practice condition. Discuss the consequences and seriousness of each of the following two kinds of non-random sampling:

(1) Subjects are not randomly sampled from some specified population.

 

(2) Subjects are not randomly assigned to conditions.

 

 In general, which type of non-random sampling is more serious and why?

 

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Expert Answer

Step 1

1)

When the subjects are not randomly sampled from the specified population, there will be will be a case of greater biasedness in the selection because of unequal chance of candidate being selected. The person who is selecting might select preferable candidate according to the requirement.

Step 2

2)

If subjects are not randomly assigned to conditions, then there may be the chance of biasedness in the selection. In this case, if the person already knows abou...

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