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HP 10bII+ User Manual Page 143

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Example 3
The variable Z is a standard normal random variable. Find z so that the probability that Z is
less than z and greater than -z is equal to 0.95.
The given area is 0.95. The area not included is 1-0.95/2 = 0.025. Since the normal
distribution is symmetrical, half of the desired area is in the lower tail, .05/2=.025. The
desired area corresponds to a lower tail probability of .025.
Table 12-25 Example converting from lower tail (the inner area)
Figure 19
- 1 .959964
Returns desired value of z.
Statistical Calculations 135


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