Testing 2 samples - Mean

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Author: Bob Kibler

Description:

You will be able to:

Test claims that compare an average value from 2 independent populations
determine if a z-test or t-test is the appropriate technique
the test statistic in a z-test and a t-test are obtained in similar ways, but how the critical value is determined is different
summarize the results obtained in a non-statistical way

NOTES

Testing 2 samples follows the same 5 steps as testing 1 sample
The type of test (z or t) is determined based on the sample size and whether or not the standard deviation of the population is known
It is important to summarize the results in a non-statistical (easy to understand) way

(more)

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Tutorial

2 sample test for mean - INTRO

Example 1 - Ztest

This is a z-test due to a large sample size

Example 2 - Ztest

This is a z-test due to large samples

Example 3 - T-test

**This is a t-test due to a small sample size and an unknown standard deviation for the population

Example 4 (T-test)