64.) What is the main difference in the research design of an experiment versus

Question

64.) What is the main difference in the research design of an experiment versus a correlation?

            a. an experiment involves the manipulation of at least 1 variable

            b. a correlation involves the manipulation of at least 2 variables

            c. an experiment involves the measurement of at least 2 variables

            d. both answers a and b

65.) Which of the following are general uses for correlations?

            a. for making predictions about one variable based on another

            b. for validating psychometric tests (such as an IQ test)

            c. for a assessing the reliability of psychometric tests (such as an IQ test)

            d. all of the above

66.) In general, what information is contained in the numerator of the test statistic for a correlation?

            a. how each variable (X and Y) cause changes in a third variable (Z)

            b. how each variable (X and Y) vary separately

            c. how each variable (X and Y) co-vary together

            d. how each variable (X and Y) cause each other

67.) Which of the following are TRUE of statistical reliability and statistical validity?

            a. reliability evaluates the extent to which the same scale is consistent across time

            b. validity evaluates the extent to which the scale is measuring the intended construct

c. validity can evaluate either the extent to which your scale correlates well with other scales measuring the same construct OR the extent to which your scale correlates poorly with other scales measuring different constructs

d. all of the above are true

68.) A researcher finds that within his sample, a significant, positive correlation exists between an individual’s age and their weight. How should the researcher interpret this information?

            a. An increase in one’s age causes one’s weight to increase.

            b. An increase in one’s weight causes one’s age to increase.

            c. There is a direct relationship between one’s age and one’s weight

            d. Both answers A and B

Explanation / Answer

64. Option A is correct.

65. Option A is correct.

66. Option C is correct.

67. Option D is correct.

68. Option C is correct.

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