HPER 3150
LAB6
This lab will help you practice norm-referenced decision making about reliability and validity.
Complete the problems below and submit this worksheet at the end of lab.
1. Jesse obtained a score of 120 on a test with a SEM of 6 points. You can be 95% confident that
Jesse’s true score falls between what two values?
2. Jamie has an observed score of 500 on the SAT verbal. The reliability of the test is .91 and the
standard deviation is 100 points. You can be 95% confident that Jamie's true score falls between
what two values?
HINT: use the SEM formula on pg. 93
3. Describe the relationship between reliability and validity.
4. Describe the relationship between reliability and objectivity.
5. Fill in the blanks with two words in each blank.
Observed score = _______________
+ _______________
6. Given: s2o = 50, mean = 460; s2t = 34, s = 7.07; s2e = 16; N = 50. What is the reliability of this
test? The answer is a number.
HINT: remember the definition of reliability
7. Fill in the following values: lowest value for reliability ____; highest possible value for
reliability ____; minimum desired value for reliability for a written test ____.
HINT: If necessary, use the formula on pg. 84 to confirm your first two answers
8. Professor Jones correlated scores from Monday’s 8:00 a.m. tennis class volley test with
Tuesday’s 8:00 a.m. tennis class volley test. Different students are in each of the classes. Can the
resulting correlation coefficient be interpreted as a reliability coefficient? Explain your answer.
9. What word best describes reliability?
10. What word best describes validity?
11. Dr. Mitchell developed a test with the following characteristics: mean = 50, s = 10, and rxx' =
.84. John scored 40. What is your best guess of John's true score? Why?
12. With which type of validity would you most likely see a PPM reported? Why?
13. How do you determine if a reported Pearson product moment correlation coefficient is a
reliability coefficient or a validity coefficient?
14. How does one differentiate between concurrent and predictive validity?