Reference - HP 50g User Manual

Then, we reject H : = 150, against H : 150. The test z value is
0 1
-8
z = 5.656854. The P-value is 1.54 10 . The critical values of
0
z = 1.959964, corresponding to critical x range of {147.2 152.8}.
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Reference

Additional materials on statistical analysis, including definitions of
concepts, and advanced statistical applications, are available in Chapter
18 in the user's guide.
Page 16-11