Exam 17: Tests and Measurements

When a test has been shown to be measuring what it purports to measure, then we may assume that the test is

For a given item, when the performances of those whose overall scores put them among the highest third of the group are compared with those who scored among the lowest third of the group, the resulting difference is called the

The reliability of a certain test is .80, whereas the reliability of the criterion is only .30. What is the highest possible validity value for this test?

A psychologist wants to assess the reliability of a new test of Self Control, the higher the scores the higher the level of control. A random sample of college students is selected and given the test. In order to tap the reliability, the test is scored on the basis of comparing the results of the odd items versus the even items. The data follow: Subject\# Odd Even 1 45 57 2 50 48 3 35 57 4 62 55 5 55 60 6 38 50 7 55 50 8 45 38 9 65 70 10 55 50 -What is the correlation when corrected by the Spearman-Brown?

The test-retest method can be used to assess a test's

A researcher is interested in whether a correlation exists between Alcohol scores and Drug Abuse scores on the MAQ (Maryland Acquisition Questionnaire). A group of inmates, all of whom had at least two previous incarcerations, were given the MAQ and their Drug and Alcohol scores were compared. -Is it significant?

Correlating test scores with an independent measure of the trait being measured provides an estimate of the test's validity.

Suppose that you as a statistical consultant were given the following test data from a researcher: M = 400, SD = 32 and the standard error of measurement = 100. You are asked to use the Rulon formula for finding the test's reliability.

Is the test proving to be reliable?

A certain test has been found to have an SD of 50 and a standard error of measurement of 32. Using the Rulon formula, find the rtt (reliability value) for the test.

Test validity provides an estimate of whether or not the test is measuring what it has been designed to measure.

A test constructor is interested in discovering how long a set of sub-tests must be to reach a reliability value of .85. For each sub-test, the following significant correlations were found: a. .739 b. .653 c. .585 d. .790

When test scores are correlated with an already established and accepted measure of the construct under study, then the procedure was used to assess

The standard error of measurement on a certain test has been found to be 10 with an SD of 15.00. Using the Rulon formula, find the rtt (reliability value) for the test.

Test reliability provides an estimate of the stability and consistency of the measures.

An example of an internal consistency reliability method would be the

A psychologist wants to assess the reliability of a new test of Self Control, the higher the scores the higher the level of control. A random sample of college students is selected and given the test. In order to tap the reliability, the test is scored on the basis of comparing the results of the odd items versus the even items. The data follow: Subject\# Odd Even 1 45 57 2 50 48 3 35 57 4 62 55 5 55 60 6 38 50 7 55 50 8 45 38 9 65 70 10 55 50 -Is it significant? .

Another researcher attempted to shorten the NCAA test shown above and reduced the number of items to only 20. The mean on this revision was 10 with an SD of 3. Find its KR21 reliability.

Using the standard error of measurement found above, find the confidence interval at the .95 level for the following KISS scores : a. 40 b. 45 c. 50 d. 55 e. 57

The Spearman-Brown prophecy formula is used to correct for