TI-89 / TI-92 Plus / Voyage™ 200 PLT Statistics with List Editor App ‰ Ints (Intervals) Menu 188
2-PropZInt
Description
2 ‰ (
Ints) Æ 6:2.PropZInt for the TI-89
‰ (Ints) Æ 6:2.PropZInt for the TI-92 Plus / Voyage™ 200 PLT
2.PropZInt (two-proportion z confidence interval) computes a confidence interval for the
difference between the proportion of successes in two populations (p
1
Np
2
). It takes as
input the count of successes in each sample (
x1 and x2) and the count of observations in
each sample (
n1 and n2). The computed confidence interval depends on the user-
specified confidence level probability.
Inputs
Successes, x1 Number of positive sample results from trial one.
n1 Sample size in trial one.
Successes, x2 Number of positive sample results from trial two.
n2 Sample size in trial two.
C Level (optional) Confidence level probability with default = .99
Outputs
Outputs Stored to Description
C Int lower,
upper
Confidence interval containing confidence level probability of
distribution.
phatdiff phatdiff The calculated difference between proportions.
ME me Margin of error.
p1_hat p1_hat First sample proportion estimate.
p2_hat p2_hat Second sample proportion estimate.
n1 n1 Sample size in data sequence one.
n2 n2 Sample size in data sequence two.
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