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Can you use at test with different sample sizes?
Even though you can perform a t-test when the sample size is unequal between two groups, it is more efficient to have an equal sample size in two groups to increase the power of the t-test. Welch’s t-test is for unequal variance data.
How do you compare data in different sample sizes?
One way to compare the two different size data sets is to divide the large set into an N number of equal size sets. The comparison can be based on absolute sum of of difference. THis will measure how many sets from the Nset are in close match with the single 4 sample set.
Do you need equal sample sizes for ANOVA?
There is no equal sample size assumption for ANOVA. If your data satisfies the 3 assumptions (Normality, equality of variance and independence) you can run ANOVA. But if our sample size is very small (as in eg) the data may not satisfy assumptions and you will have to run Kruskall Wallis.
When to use a paired t test with unequal sample sizes?
Hey Luke. A paired t-test when you have unequal sample sizes does not make any sense, conceptually or mathematically. Conceptually, a paired t-test is good for when your “before” values have a lot of variance, relative to the difference between your before and after values.
Can a nonparametric test be used to test normality?
If your sample sizes are very small, you might not be able to test for normality. You might need to rely on your understanding of the data. Or, you can perform a nonparametric test that doesn’t assume normality. The sections below discuss what is needed to perform the test, checking our data, how to perform the test and statistical details.
Is the two sample t-test assumes normality?
So, as constructed, the two-sample t-test assumes normality of the variable X in the two groups. On the face of it then, we would worry if, upon inspection of our data, say using histograms, we were to find that our data looked non-normal.
Is the data in the paired t test paired?
This is not “paired” data. You can clearly see it isn’t paired data because you have no way of pairing a student last year to a student this year. So you just want to perform a typical two-sample t-test, which is done with =ttest (array1, array2, 2, 2)