Khan Academy
Khan Academy: Normal Distribution: Area Above or Below a Point
Use a z-table to find the probability of a particular measurement. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Khan Academy
Khan Academy: Normal Distribution: Area Between Two Points
Use a z-table to find the probability that a particular measurement is in a range. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Texas Instruments
Texas Instruments: Numb3 Rs: Choosing Contenders
Based off of the hit television show NUMB3RS, this lesson shows students two different ways to "normalize" scores: by applying a created scalar factor so that all scores have a mean of one, or by using z-scores. Students are walked...
Other
Magoosh: Statistics Fundamentals
An online course on the fundamentals of statistics including video lessons in Mean, Median, and Mode; Weighted Averages; Quartiles and Boxplots; Range and Standard Deviation; Normal Distribution; Z-scores; Intro to Inferential...
University of Colorado
University of Colorado: Normal Probabilities Applet #1
This Applet will assist the user in questions which specify a range of raw scores or z-scores and ask for a probability associated with them.
Other
Westgard Qc: Hypothesis Testing
A good description of hypothesis testing. Refers to the null hypothesis as a "straw man" that is either left standing or knocked down. Other links are provided to related parts of the topic.