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Tables of the cumulative probability distribution of the standard normal distribution (mean = 0, variance = 1) are readily available. Almost all textbooks on statistics will contain one and there are several sources on the net. For each value of z, the table gives Φ(z) = prob(Z < z). The tables usually gives value of z in steps of 0.01 for z ≥ 0. For a particular value of z, the height of the probability density function is approximately 100*[Φ(z+0.01) - Φ(z)].
As mentioned above, the tables give figures for z ≥ 0. For z < 0 you simply use the symmetry of the normal distribution.
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What is a normal distribution graph called?
It has no special name - other than a normal (or Gaussian) distribution graph.
Explain why the term bell curve is appropriate for a graph of a normal distribution of traits?
No
What kind of graph would you use to show the scores?
When putting the scores in, you use the normal distribution graph, which is the best start.
How can one determine the median from a graph?
The answer depends on what the graph is of: the distribution function or the cumulative distribution function.
Is this correct the graph of a normal distribution is bell-shaped?
Roughly speaking, yes. However, bells do not extend asymptotically to infinity.
