Statistical Test for Differences Between Groups with Varying Sizes

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To determine if the differences between groups with varying sizes are statistically significant, the t-test is recommended for comparing group means. If the data does not meet parametric assumptions, a non-parametric alternative like the Mann-Whitney U test may be appropriate. The discussion emphasizes the importance of considering sample size in the analysis. Clarification on whether "differences among the groups" refers to means or distributions is necessary for accurate testing. Overall, the t-test is a suitable choice for assessing mean differences in this context.
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A very simple thing; I have to collect data with 4 different group size. Something like;

Group A; 12.4, 17.8, 12.5 ...
Group B; 15.2, 9.5, ...

I simply want to know if the differences between the groups are statistically signifiant. I don't want anybody to explain the me the math, I just want the name of the statistical test.
 
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Hi,

I want to know if the variations between the group means are statistically significant (which probably mean I'll need to use the size of the sample for each group as well).
 
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You can use the t test for pairwise comparisons of means.
 

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