a. One concern with measurement is that the measurement: may leave out important

Question

a. One concern with measurement is that the measurement:

may leave out important components of the construct,

may not be an accurate reflection of the construct,

may include extra components that are not part of the construct.

All of the other choices are concerns.

b. The validity of a measurement procedure is usually established with a correlation. T/F

c. Just by chance, a researcher may obtain a sample with characteristics that are very different from the population; however it is more likely that this kind of sample is the result of :

simple random sampling.
selection bias.

stratified selection.

systematic selection

Explanation / Answer

a.One concern with measurement is that measurement might include extra components that are not part of the construct. For example, while measuring depression there might be several components that judge it and depression score is total of score son all the components. Option c.

b. Correlation is a measure of reliability. Reliability refer consistency of a measure, thus test-retest correlation requires measure on a particular group of people at a particular time and then again on the same group at another point of time. The test-retest correlation is measured and plotted. A high Pearson correlation value indicate good reliability. Thus, correlation is used to measure reliability not validity. Statement is false.

c. A simple random sample of sample size n is a sample in which each each set of n elements in the population has an equal chance of selection. Thus, the sample is a result of simplel random sampling.

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