Why is the null hypothesis in a correlation hypothesis test usually that the population correlation is zero?
What will be an ideal response?
It is partly due to tradition, but there's also a reason. We hypothesize that the population correlation is zero because (1) correlation = 0 is the midpoint between positive and negative correlations; and (2) zero correlations between variables are important; they indicate that the two variables are independent.
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Indicate whether the statement is true or false
Developmental supervision may not be the match of initial supervisory approach with the teacher's
a. developmental levels b. expertise c. commitment d. collaborative supervision
Discriminant validity is the extent to which ______.
A. one measure can be differentiated from another measure that it should not be related to B. a measure can distinguish between groups it should be able to distinguish between C. two or more different measures for the same construct are related D. scores obtained by a measure predict outcomes it should predict
Researchers can use quasi-experimental research designs to make inferences about causation by:
a. Ruling out threats to internal validity b. Excluding participants who do not conform c. Using statistical analyses d. Using random assignment