The normal curve never touches the X axis.
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One cannot reasonably do z transformations on ratio data.
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The area beyond a z score of +2.58 is 0.005.
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The standard deviation of the z distribution is always equal to 1.0.
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In a plot of the normal curve, frequency is plotted on the X axis.
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If the original raw score distribution is not normally distributed, the mean of the z transformation scores of the raw data will not equal 0.
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A z transformation will allow comparisons to be made when units of distributions are different.
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It is impossible to have a z score of 23.5.
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The area under the normal curve represents the percentage of scores contained within the area.
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The normal curve is a symmetric, bell-shaped curve.
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