A randomized study on n=50 rats tested whether living in a crowded situation had
ID: 3050765 • Letter: A
Question
A randomized study on n=50 rats tested whether living in a crowded situation had an effect on stress levels.
13. What is the definition of a random sample?
Random sampling is everyone in the study had an equal chance to be selected for the specific sample.
14. What is the definition of random assignment?
Random assignment is a cornerstone of experimental design for the outcome.
15. Imagine that the researcher failed to use a random sample. How would this failure limit her study’s conclusions?
16. Imagine that the researcher failed to use random assignment in her study. How would this limit her research conclusions?
17. No matter what hypothesis test you are using, there are two basic “differences” that you are analyzing in ALL hypotheses tests. What are these two “differences”?
l. ____________________________________________________
2. ____________________________________________________
18. What is meant by the term “statistical significance”?
Explanation / Answer
Result:
A randomized study on n=50 rats tested whether living in a crowded situation had an effect on stress levels.
13. What is the definition of a random sample?
Random sampling is everyone in the study had an equal chance to be selected for the specific sample.
14. What is the definition of random assignment?
Random assignment is that each participant has the same opportunity to be assigned to any one of the groups in the study.
15. Imagine that the researcher failed to use a random sample. How would this failure limit her study’s conclusions?
The sample is not the representation of the population and generalize the results to study population is questionable.
16. Imagine that the researcher failed to use random assignment in her study. How would this limit her research conclusions?
Random assignment ensures that there are no systematic differences between the groups before the treatment. The failure to use random assignment results in any differences found between the groups may not attributable to the treatment, rather than a confounding variable.
17. No matter what hypothesis test you are using, there are two basic “differences” that you are analyzing in ALL hypotheses tests. What are these two “differences”?
l. difference in mean
2. difference in variation
18. What is meant by the term “statistical significance”?
Statistically significant result is a result that is not attributed to chance.
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