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Do the populations in an unpaired t-test have same variance?

4 years ago in Statistical Analysis By Pradeep Kumar

Statistical Tests

In an unpaired T-test, do the 2 populations have the same variance or are they different? Also, are the errors dependent? Please guide me on this.

All Answers (3 Answers In All) Post Your Answer

By Jasmin Answered 4 years ago

Errors can be independent or dependent depending on the value and the group means. For example, if there are 6 values in a group, then the error is not independent. That is, some of the other factors might result in the increase or decrease of the value.

Reply To Jasmin

By Suma Answered 4 years ago

Unpaired T-test has same variance for the two populations. You can use prism test to determine the variance. The P value from the test answers the questions such as variance of the populations and random selection of samples. Small value of P suggests that the variances are not similar. However, if you have plenty of data you can interpret the results and determine if the variances are equal or not.

Reply To Suma

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