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Consider the standard normal distribution.
a) Use the Z table to verify that q1 is approximately -0.67 and q3 is approximately 0.67.
b) Find the interquartile range for Z, and explain what this means.
c) Verify that the inner fences for Z are f1 = -2.68 and f3 = 2.68.
d) Verify that the probability that a standard normal random variable will fall beyond the inner fences is approximately 0.007.
e) Find the outer fences for Z.
f) Find the probability that a standard normal random variable will fall beyond the outer fences.
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At the .05 level of significance, is there convincing evidence that the number of absences per employee has increased?
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