Knowing that a set of scores approximates a normal distribution allows us to make probability statements with respect to those scores,given that we know the mean and standard deviation.

Question

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A normal distribution is characterized by its mean and standard deviation, and knowing these parameters allows us to calculate probabilities for specific ranges of scores or values. This is due to the well-defined properties of a normal distribution, such as its bell-shaped curve and the fact that a certain percentage of values lie within a certain number of standard deviations from the mean.

Knowing That a Set of Scores Approximates a Normal Distribution