## Means Testing: The Procedures

## Before proceeding to conduct a hypothesis test between two sample means, we must determine certain characteristics and parameters about the samples, some of which you will recognize from previous lessons.

## Question no. 1:

Are the samples related in some way?## YES.

If a relation exists between the two variables, the samples are said to be dependent; the data of sample 1 could be paired with data from sample 2. In cases like these, we would be interested in the differences (

d) between the paired values. If the populations are normally distributed and a relationship exists, we would conduct a hypothesis test of two dependent means involving the Student t-distribution.

## NO.

If no relation exists, then the variables are independent. Other questions must be asked to determine the testing procedures to be used on independent variables.

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