The graph shows the standard normal distribution pdf (probability density
function), the location of the critical points z
, 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
Additional examples of confidence interval calculations are presented in
Chapter 18 in the calculator's user's guide.
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 .: Single sample hypothesis testing for the population mean,
, with known population variance, or for large samples with unknown