This is the magic of the Standard Normal Curve! Test Research Hypotheses about different groups.Estimate how many people might be affected based on sample size.Predict the probability of events happening.Together, these features will allow you to: Standard Normal Curve: I know that there should be specific and predictable proportions (percentages) of scores between the mean and each standard deviation away from the mean. I can use probability distributions to understand the likelihood of specific events happening. Probability Distributions: I know that I can make predictions from probability distributions. Law of Large Numbers: I know through the Law of Large Numbers that if I have enough data, then my sample will begin to become more and more "normal' (have the characteristics of a normally distributed population, including the important characteristics above). Those important characteristics of a Standard Normal Distribution are deceptively simple, so let's put some of these ideas together to see what we get. from An Introduction to Psychological Statistics) \): Area Beyond 2 Standard Deviations (CC-BY-NC-SA Foster et al.
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