The Normal Distribution and z Scores

This applet will allow you to explore the normal distribution by changing values of the mean, the standard deviation, the observation, or z itself, and examine the areas under the curve. When you change any value you must press the Enter (or Return) key to have that value take effect.

from minus infinity to the z-score
from the z-score to positive infinity
scores more extreme (i.e., further from the middle) than the z-score
scores less extreme (i.e., closer to the middle) than the z-score

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