AP® Statistics · Unit 1 · Topic 1.9
Comparing z-Scores Across Different Distributions
Watch it explained
- How it worksWalk me through standardizing two different tests so their scores land on one scale.
- Worked exampleCompare a 92 in a class with mean 80 and SD 6 to an 85 in a class with mean 70 and SD 4.
- Common mistakeWhy isn't the higher raw score always the better performance?
- Ties togetherHow do z-scores connect the shape of a distribution to the normal model?
Check yourself
Your turn1 of 2
In Test A, a score of 91 comes from a distribution with mean 79 and SD 11. In Test B, a score of 21 comes from a distribution with mean 11 and SD 3. Find zB minus zA, how many more standard deviations above its mean Test B's score is compared to Test A's.End of topic.