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What are the assumptions violated?
a situation in which the theoretical assumptions associated with a particular statistical or experimental procedure are not fulfilled.
When assumptions are violated what do we use?
For example, if the assumption of homogeneity of variance was violated in your analysis of variance (ANOVA), you can use alternative F statistics (Welch’s or Brown-Forsythe; see Field, 2013) to determine if you have statistical significance.
What happens when one sample t test is violated?
Often, the effect of an assumption violation on the one-sample t test result depends on the extent of the violation (such as how skewed the distribution of the population is). Some small violations may have little practical effect on the analysis, while other violations may render the one-sample t test result uselessly incorrect or uninterpretable.
What are assumptions made when conducting a t-test?
T-Test Assumptions. The first assumption made regarding t-tests concerns the scale of measurement. The assumption for a t-test is that the scale of measurement applied to the data collected follows a continuous or ordinal scale, such as the scores for an IQ test. The second assumption made is that of a simple random sample,…
Which is an example of a violation of an assumption?
The independent t-test—violations of assumptions. Another assumption that is often violated with large consequences is the assumption of homoscedasticity. Homoscedasticity means that both groups have equal variances. Often Levene’s test and an F-test are used to assess whether the assumption is violated.
When is it good or bad to test assumptions?
But in some cases, it does not help much when researchers do. For example, when there are no clear standards on how to test assumptions, and on the robustness of tests against violation of these assumptions, results can still be interpreted badly.