CLASS - PSY411, Research Methods and Statistics

TOPIC - Normal Curve/Derived Scores (Standard Scores z Scores)

QUESTIONS NEEDED TO DO:

1. In a distribution = 80 and sigma = 20.

a) What are the standard scores (z scores) for each of the following?

10, 6, 70, 90, 73

For the same distribution what are the scores associated with the following z scores?

Z= + 1.0, Z = 0, Z= +1.5, Z= - 2

1. For the following distribution with mean = 100, s= 20
2. What proportion of scores fall below 40?
3. What proportion of scores fall above 140?
4. What proportion of scores fall between a score of 90 and 100?
5. What proportion of scores fall between a score of 80and 120?
6. What proportion of scores fall beyond 40 (less than 40) and greater than 140?

Thank you!