A sample made up of volunteers may be biased because:
a. the control group and the experimental group can never be equated.
b. it is not economical.
c. they may not be representative of the total population.
d. none of the above.
C
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Girls have a higher maximal oxygen consumption when compared to boys
a) True b) False
Which one of the following statements is unconditionally true?
a. High schools are periodically evaluated for accreditation. b. Secondary schools are periodically evaluated for accreditation. c. Junior high schools are periodically evaluated for accreditation. d. All public schools are periodically evaluated for regional or state accreditation.
Achievement patterns for different racial and ethnic groups are
a. reliable individual predictors. b. genetically based. c. trends, not labels that fit every individual. d. totally unreliable and insignificant for use in comparison purposes.
A correlation coefficient indicates:
a. only quantitative information about a relationship between variables b. only qualitative information about a relationship between variables c. the relationship between the independent and dependent variables d. the strength and direction of the relationship between variables