Page 16-9
The graph shows the standard normal distribution pdf (probability density
function), the location of the critical points ±z
α/2
, the mean value (23.3)
and the corresponding interval limits (21.98424 and 24.61576). Press
@TEXT to return to the previous results screen, and/or press @@@OK@@@ to exit the
confidence interval environment. The results will be listed in the calculator’s
display.
Additional examples of confidence interval calculations are presented in
Chapter 18 in the calculator’s user’s guide.
Hypothesis testing
A hypothesis is a declaration made about a population (for instance, with
respect to its mean). Acceptance of the hypothesis is based on a statistical
test on a sample taken from the population. The consequent action and
decision-making are called hypothesis testing.
The calculator provides hypothesis testing procedures under application 5.
Hypoth. tests.. can be accessed by using
‚Ù——@@@OK@@@.
As with the calculation of confidence intervals, discussed earlier, this
program offers the following 6 options:
These options are interpreted as in the confidence interval applications:
1. Z-Test: 1 µ.: Single sample hypothesis testing for the population mean,
µ, with known population variance, or for large samples with unknown
population variance.
SG49A.book Page 9 Friday, September 16, 2005 1:31 PM
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