Compare the goals of researchers who use the observational method, the correlational method, and the experimental method. Provide an example of a question that is best addressed by each method
What will be an ideal response?
Answer: The observational method is used to describe some phenomenon, and is often used to test hunches informally or more formally via systematic observation or archival analyses. The correlational method is designed to determine the relationship between two phenomena (variables) and is useful in making predictions; observations and surveys are often used in this kind of research. The experimental method is used to determine whether two related phenomena are causally related, and enables researchers not only to make predictions, but also to understand why two variables might be related. (Note: Students generate their own examples.)
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A random sample of n = 4 scores is obtained from a population with a mean of ยต = 80 and a standard deviation of ? = 10 . If the sample mean is M = 90, what is the z-score for the sample mean?
a. z = 20.00 c. z = 2.00 b. z = 5.00 d. z = 1.00
Explain when you would use the Kruskal-Wallis test versus the Friedman test
What will be an ideal response?