Online Statistics Tutor: Z-scores & Normal Probabilities
During my days of teaching introductory statistics, students were often looking for additional resources to help them master the material. My hope is for this post to supplement and aid students who are being introduced to statistics, or anyone looking for refresher material. That being said, if there is a specific topic that you would like me to cover that is not found here, please mention this in the comments and I will do my best to produce a lesson for it. Normal Probability Normal probability is referring to making inference (coming to a conclusion and generalizing that conclusion to a population) about the likelihood of an event based upon the assumption the outcome is normally distributed. In short, assume normally distributed data in order to make inference. For example, let's assume human height is normally distributed. How likely is it that a man is over 5 feet 10 inches (70 in)? Let's say the population has a mean of 68 inches with a standard deviation of 4 i...