A researcher selects a sample of six professors, six students, and six administrators at a local school and has them rate the effectiveness of an innovative new teaching style. In this example, is it possible that the weighted mean ratings will equal the arithmetic mean for the entire sample of 18 participants?
A. No, the weighted mean is never exactly equal to the arithmetic mean.
B. Yes, because there are an equal number of participants in each sample.
C. Yes, because the sample sizes are selected from the same school.
D. It is not possible to know this without knowing the mean for each sample
Ans: B
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The purpose of canonical correlation is to determine the magnitude of the relationship between
a. a set of predictor variables and a set of criterion variables. b. a set of predictor variables and an individual's group membership. c. two or more factor scores. d. a set of predictor variables and a single criterion variable.
What is the situation when students have many associations between words and meanings?
a. They become confused. c. Their vocabularies tend to be superficial. b. They have rich vocabularies. d. None of these apply.
The emphasis in the working-memory model is on three memory stores, among which there is a continual flow of information from the sensory register to short-term memory and then to the long-term store
Indicate whether the statement is true or false
Analysis of covariance is one type of:
a. Matching b. Random assignment c. Statistical control d. The third variable problem