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NHANES-CMS Linked Data Tutorial

Hypothesis Testing when using the NHANES-CMS linked data

Purpose

The t-test  and chi-square statistics are used to test statistical hypotheses about population parameters.  This module will demonstrate the use of these statistics in NHANES data analysis.

Task 1: Use the t-test statistic

The t-test is used to test the null hypothesis that the means or proportions of two population subgroups are equal OR that the difference between two means or proportions equals zero when the estimates are based on a small probability sample. When using a simple random sample, small is defined as less than 30.

Task 2: Perform chi-square test

The chi-square test is used to test the association between two variables cross-classified in a two-way table and the homogeneity of their association.

 

 

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