|Frequency Histogram for Composite Scores on Final Exam|
So, in addition to the practice on basic descriptive statistics students are completing for tomorrow (to access the accompanying PsychSim Module for this WS, click here), we've been using some meaningful examples of score distributions to become more comfortable with the topic. Particularly, we've been examining performance data from our 1st Semester final (which, as the frequency histogram above illustrates, distribute rather normally).
However, if you're still feeling confused about z-scores, the normal curve, percentile ranks, and standard deviation, there are a number of great websites out there to give you some guidance (unfortunately, our text does not go into a great amount of detail about these statistical concepts). Consider consulting any of these for review:
- A Beginner's Guide to Descriptive Statistics (includes examples and procedure for calculating standard deviation).
- Online calculator for descriptive stats (can copy & paste data and it will give you the standard deviation, among other measures)
- Handy, printable guide to the Normal Curve & Z-scores
- Statistics Tutorial: Standard Normal Distribution (& z-scores)