Java Applets for Power and Sample Size

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Title:

Java Applets for Power and Sample Size

Url:

http://homepage.stat.uiowa.edu/~rlenth/Power/

Creator:

Lenth, Russ

Publisher:

University of Iowa

Description: This collection of free, interactive Java applets provides a graphical interface for studying the power of the most commonly encountered experimental designs. Intended to be useful in planning statistical studies, these applets cover confidence intervals for means or proportions, one and two sample hypothesis tests for means or proportions, linear regression, balanced ANOVA designs, and tests of multiple correlation, Chi-square, and Poisson. Each applet opens in its own window with sliders, which are convertible to number-entry fields, for manipulating associated parameters. Controlling for the other parameters, users can change sample size, standard deviation, type I error (alpha) and effect size one at a time to see how each affects power. Conversely, users can manipulate the power for the test to determine the necessary sample size or margin of error. Additional features include a graph option by which the program plots a dependent variable (i.e. power) over a range of parameter values; the graph is automatically updated as the parameters are changed. Each dialog window also offers a Help menu which provides instructions for using the applet. The applets can be used over the Internet or downloaded onto the users own computer.

LC Classification:

Science -- Mathematics -- Mathematical statistics -- Analysis of variance and covariance. Experimental design
Science -- Mathematics -- Mathematical statistics -- Study and teaching. Research
Science -- Mathematics -- Mathematical statistics -- Testing of hypotheses -- Chi-square test
Science -- Mathematics -- Probabilities -- Distributions. Characteristic functions
Social sciences -- Statistics -- Theory and method of social science statistics -- Hypothesis testing

GEM Subject:

Mathematics -- Statistics

Key Concept:

Mathematics -- Chi square
Mathematics -- Confidence intervals
Mathematics -- Correlation
Mathematics -- Frequency distributions
Mathematics -- Hypothesis testing
Mathematics -- Statistics
Mathematics -- Tests of variance

Date Issued:

2008

Resource Type:

Collection
Instructional Material -- Model
Instructional Material -- Demonstration
Instructional Material -- Interactive Simulation

Format:

Document -- HTML
Application -- Java

Audience:

Educator
Learner

Education Level:

Higher Education
Higher Education -- Graduate/Professional
Higher Education -- Undergraduate (Lower Division)
Higher Education -- Undergraduate (Upper Division)
Higher Education -- Technical Education (Upper Division)
Higher Education -- Technical Education (Lower Division)
Vocational/Professional Development Education

Language:

English

Access Rights:

Free access

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Source:

CAUSEweb

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