HP 39gII - The Inference App

HP App Summaries 23
HP App Summaries
23
The Inference App
The Inference App contains tools for Inferential Statistics, including creating confidence intervals and hypothesis testing. This App can
import summary statistics from any column of the Statistics 1-Var or 2-Var Apps. Table 8 summarizes the Inference App functionality. One
unique feature of this HP App is that the various confidence intervals and hypothesis tests contain default values that correspond to the
online help sections in the App. Press the App key, scroll down to select the Inference App, and press the START menu key to get started.
The Inference App starts in the Symbolic view.
Table 8 Inference App Summary
Summary of Functionality View Name and Display
Press Symb to return to this view at any time. The Inference Symbolic view contains settings
to define a confidence interval or hypothesis test. The fields are:
• METHOD: chooses between hypothesis test or confidence interval
• TYPE: chooses from a variety of Z- and T-distributions
• ALT HYPOTH: chooses one of three alternative hypotheses (hypothesis test only)
Inference Symbolic View
Press Num to enter the Inference Numeric view. This view contains fields for the sample
statistics (e.g. sample mean and sample size n), the population parameters (e.g. null
hypothesis mean, and standard deviation, σ ), and the significance level, . The menu
items are:
• EDIT: opens an input box to edit the chosen value
• IMPRT: imports statistics (such as , n, etc.) from any column in the Statistics 1-Var or
Statistics 2-Var apps (or any app based on these two)
• CALC: computes the test results and displays them numerically in a table
Inference Numeric View
x
μ
0
α
x