Question

If a researcher wants to compare two groups of asthmatic children, those who received the flu vaccine vs those who did not, on number of emergency depot visits in the past year (not normally distributed, n= 345)

Manning Whitney U test
OR
Independent test

Answer 1

Manning Whitney U test-Mann-Whitney U test is the non-parametric alternative test to the independent sample t-test. It is a non-parametric test that is used to compare two sample means that come from the same population, and used to test whether two sample means are equal or not. Usually, the Mann-Whitney U test is used when the data is ordinal or when the assumptions of the t-test are not met.

The independent t-test, also called the two sample t-test, independent-samples t-test or student's t-test, is an inferential statistical test that determines whether there is a statistically significant difference between the means in two unrelated groups.

So here independent t test