Reliability and Validity Worksheet.

Reliability and Validity Worksheet Instrument Reliability Imagine that you must develop a test to measure state anxiety. You develop a 30-question test. The scores of the normative sample on the two administrations of the test are listed below. Use Microsoft® Excel® to create a scatterplot with the provided scores, formatted as shown in the example graph. 30-Point Test to Measure State Anxiety ExamineeFirst AdministrationSecond Administration A1715 B2218 C2521 D1215 E714 F2827 G2724 H85 I2125 J2421 K2727 L2119 Answer the following questions about the scatterplot and data: 1.What type of reliability assessment does this represent? 2.What conclusions can you draw about the reliability of the test based upon the scatterplot? Why do you draw these conclusions? 3.Would you say this method of reliability assessment is the best to use to evaluate the reliability of test to design the construct of state anxiety? Why or why not? Instrument Validity A valid instrument is one that measures what it says it measures. Validity depends on the amount and type of evidence there is to support one’s interpretations concerning data that has been collected. This week, you discussed three kinds of evidence that can be collected regarding validity: content-related, criterion-related, and construct-related evidence. 1.How would you evaluate the validity of the test described above? Provide a plan to evaluate each type of validity listed below: •Content-related •Criterion-related •Construct-related 2.Assume the test above correlates with the State-Trait Anxiety Inventory with a correlation coefficient of .20. What type of validity would this correlation represent? What does this correlation show about the validity of the new instrument?