Application Guide

1-Prop z Interval (zInterval_1Prop)
Computes a confidence interval for an unknown proportion of successes. It takes as
input the count of successes in the sample x and the count of observations in the
sample n. The computed confidence interval depends on the user-specified confidence
level.
This test is useful in determining the probability of a given number of successes that
can be expected for a given number of trials. For instance, casino examiners would use
this test to determine if observed payouts for one slot machine demonstrate a
consistent pay out rate.
2-Prop z Interval (zInterval_2Prop)
Computes a confidence interval for the difference between the proportion of successes
in two populations (p
1
-p
2
). It takes as input the count of successes in each sample
(x
1
andx
2
) and the count of observations in each sample (n
1
andn
2
). The computed
confidence interval depends on the user-specified confidence level.
This test is useful in determining if two rates of success differ because of something
other than sampling error and standard deviation. For example, a bettor could use this
test to determine if there is an advantage in the long run by playing one game or
machine versus playing another game or machine.
Linear Reg t Intervals (LinRegtIntervals)
Computes a linear regression t confidence interval for the slope coefficient b. If the
confidence interval contains 0, this is insufficient evidence to indicate that the data
exhibits a linear relationship.
Multiple Reg Intervals (MultRegIntervals)
Computes multiple regression prediction confidence interval for the calculated y and a
confidence for y.
Stat Tests
Supported Statistical Tests
Hypothesis tests are available from the Lists&Spreadsheets application. For more
information regarding these functions, see the TI-Nspire™ Reference Guide.
Some of the wizards for Stat Tests display a Draw check box. By default, the box is not
selected. Selecting the box creates a Data&Statistics work area on the page and plots
the results in that work area.
ztest (zTest)
Performs a hypothesis test for a single unknown population mean, m, when the
population standard deviation,s, is known. It tests the null hypothesis H
0
:m=m
0
against one of the alternatives below.
• H
a
: mƒm
0
• H
a
: m<m
0
Lists&Spreadsheet Application 337