# Tagged Questions

57 views

### Absolute Values - Parametric or Non-parametric Test

I am looking at the absolute difference in values between pairs of numbers. I am then comparing these absolute values between two groups (e.g. Males and Females). Since these are absolute values I ...
61 views

### Which statistical test to use? Paired-sample or independent-sample?

I have 1 subject rating 40 participants on the big five personality traits and other variables. these 40 participants are in 2 conditions (20 each). I want to compare whether there is a difference ...
131 views

### Significance test for mean without assuming normality?

I'm trying to do significance test with a set of data X and see if their distribution approximates the population mean M. It's ...
112 views

### All my observations are identical. Use a non-parametric test?

I was doing test for normality on variables and came across one that had identical values for each observation. I can't do a normality test. I plotted the kernel density and it looks normal, however ...
403 views

### Mann-Whitney for non-normal distributions with n>20?

I have 12 groups of datasets (mostly non-Normal, quite right-skewed), and I would like to see if there is a significant difference within each pair. (But the data itself is not a paired dataset, as in ...
80 views

### Test for significance for multiple non-normally distributed samples

I was wondering if anyone could point me in the right direction for what exactly I'm looking for. I have binned multiple Boolean observations (1 or 0). The reason I made them Boolean is because it's ...
305 views

### Comparing P value from t test vs. Mann-Whitney test

If you analyze the same data with a t test and the nonparametric Mann-Whitney test, which do you expect to have the lower P value?
2k views

### Which test to choose when the results from t-test and Wilcoxon test are different?

I have a sample of 48. According to the central limit theorem, I may consider means of every continuous variable in my sample to have a normal distribution. However, one variable has a mean of 14 +/- ...
379 views

### Whether to use nonparametric tests to compare two groups when sample size is large but assumptions are violated

I have a data set that has 600 observations divided in two groups. I am going to compare the central tendencies (e.g., the means) of these two groups. However, there are violations of classical ...
517 views

### Why would I use ANOVA instead of a Rank-Sum test?

A colleague of mine with little statistics experience is trying to perform an experimental evaluation of a computer program. He created a between subjects design and solicited test subjects. 11 ...