All Questions
7
questions
0
votes
1
answer
57
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Importance of normality testing in clinical trials / AB tests
I’m curious to read about the importance of normality testing in AB tests and clinical trials.
It seems that there is a lot of mixed (and strong) opinions about the necessity for normality testing, ...
- 67
6
votes
2
answers
8k
views
Can we ALWAYS assume normal distribution if n >30?
I'm in a debate with a coworker and I'm starting to wonder if I'm wrong but the internet is confusing me more.
We have continuous data $[0, \infty)$ that is retrospectively selected on individuals. ...
- 185
3
votes
3
answers
2k
views
Tests of normality - qq and Shapiro-Wilk
I am new to the world of stats ...
My data had a log normal distribution, so transformed by log to get it nearer normal distribution. This is real-world data.
From here I want to establish if my data ...
0
votes
1
answer
3k
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Normality test for likert scale [duplicate]
I have a questionnaire data that consist of composite Likert scale and discrete Likert items.
Likert scales or variables are the sum of few Likert items while the one-item variables are represented ...
0
votes
0
answers
933
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Normally distributed data but small sample size, use nonparametric test?
My data set is very small (n=16) which according to a Shapiro-wilk test is normally distributed (p=0.82), despite the histogram looking questionable. When I split the data into my two categories there ...
1
vote
1
answer
138
views
Total scores are normally distributed, but subtest scores are not; what to do?
I have two sets of data for males and females: $n=33$. I'd like to compare test results for both groups. I want to do a $t$ test, and I know my data should be normally distributed if I want to use a ...
- 231
0
votes
2
answers
2k
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 ...
- 1