How does a researcher determine the meaning of a score on a norm-referenced test such as an IQ test?
Why are raw scores transformed to standardized scores, such as z-scores, in order to interpret those raw scores?
How do these standardized scores help researchers to compare the scores on two different tests with different means and standard deviations? .
How does standardizing help when comparing two scores? This solution explores this question. The solution is provided in a Word document which is attached.
Standard z score of biology midterm
Lewis earned 85 on his biology midterm and 81 on his history midterm. In the biology class the mean score was 79 with standard deviation 5. In the history class the mean score was 76 with standard deviation 3.
a) Convert each midterm score to a standard z score.
b) On which test did he do better compared to the rest of the class?