Hi, I have six treatments (0,20,40,60, 120, and 180). I used Male and female sex to test and compare each sex on different treatments using the HSD test. Now I want to compare both sexes on each treatment separately i.e. Male and female at 0. Here I want to know should I use an independent t-test or a pair t-test.
As you mentioned, while the treatment is the same, the subjects of the treatment (male and female) are independent of each other. Therefore, you should apply an independent t-test. On the other hand, if the treatment is applied to the same subjects before and after, you should use a paired t-test. I hope this clarifies your query.
Unpaired t-test for normal distribution, Mann Whitney for asymmetric.
Jochen Wilhelm
each individual applied seperately with each treatment
Do you have a pre-test for each group? If not, provided your data is normally distributed, you can go on with an independent-sample t-test. Still, if the assumption of normality is violated you may consider the use of Mann-Whitney. However, if you have a pre-test score for the two groups, you can consider using ANCOVA. You can use the pre-test scores as covariates in the analysis.
Yes, i performed normality test, my data is normally distributed Ajayi O. Samson
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