Texas Instruments TI-84 PLUS - Graphing Calculator User Manual

Chapter 13: Inferential Statistics and Distributions 232
1-PropZInt
1-PropZInt (one-proportion z confidence interval; item A) 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.
2-PropZInt
2-PropZInt (two-proportion z confidence interval; item B) 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 (
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.
Input:
Calculated
results:
Input:
Calculated
results:

Texas Instruments TI-84 PLUS - Graphing Calculator Specifications

General

Type	Graphing Calculator
Display Type	LCD
Screen Resolution	96 x 64 pixels
Processor	Zilog Z80
Memory	24 KB RAM, 480 KB Flash ROM
Power Source	4 AAA batteries (with backup lithium battery)
Connectivity	I/O port
Weight	7.4 oz (210 g)
Software	TI-OS (Texas Instruments Operating System)