Parallel-forms reliability is not a type of reliability; it is a method for assessing the reliability of a test.

Test-retest reliability is the correlation between two sets of scores obtained from the same group of individuals on two different occasions.

Ecological validity is not a type of validity; it is a concept related to the generalizability of research findings to real-world settings.

Construct validity is concerned with the extent to which a test measures what it is supposed to measure.

Meta-analysis is not a method for assessing the validity of a test; it is a statistical technique for combining the results of multiple studies.

The reliability of a test is the square of the correlation between two sets of scores obtained from the same group of individuals on two different occasions. Therefore, the reliability of a test with a correlation of 0.80 is 0.80^2 = 0.64.

The validity of a test is the square of the correlation between the test scores and the scores on a criterion measure. Therefore, the validity of a test with a correlation of 0.70 is 0.70^2 = 0.49.

Test content is not a factor that can affect the reliability of a test. The other three factors (sample size, test length, and test administration conditions) can all affect the reliability of a test.

Test administration conditions are not a factor that can affect the validity of a test. The other three factors (test content, criterion measure, and sample size) can all affect the validity of a test.

The purpose of a reliability coefficient is to estimate the consistency of a test. A reliability coefficient indicates the extent to which a test produces consistent results across different administrations or under different conditions.

The purpose of a validity coefficient is to estimate the validity of a test. A validity coefficient indicates the extent to which a test measures what it is supposed to measure.

The Pearson product-moment correlation coefficient is not a type of reliability coefficient. It is a measure of the linear relationship between two variables.

The Pearson product-moment correlation coefficient is not a type of validity coefficient. It is a measure of the linear relationship between two variables.

Reliability is the extent to which a test produces consistent results, while validity is the extent to which a test measures what it is supposed to measure. A test can be reliable but not valid, or valid but not reliable.

It is important to consider both reliability and validity when evaluating a psychological test because a test can be reliable but not valid, or valid but not reliable. A test that is reliable but not valid is not useful, because it produces consistent results that are not meaningful. A test that is valid but not reliable is also not useful, because it does not produce consistent results.