This video tutorial explains how to measure the distance of a data value from the mean using z-scores. It covers the basics of normal distribution, mean, and standard deviation. The tutorial compares SAT and ACT scores, demonstrating why direct comparison is invalid due to different scales. It introduces z-scores as a standard measure and provides examples of calculating z-scores for various data points. The tutorial concludes by applying z-scores to SAT and ACT scores to determine which score is relatively better.

What does it mean if a z-score is negative?

What are the mean and standard deviation for the SAT and ACT scores mentioned in the lesson?

How can you determine if one score is better than another using z-scores?