# Linked Questions

30 questions linked to/from Misunderstanding a P-value?
16answers
463k views

### What is the meaning of p values and t values in statistical tests?

After taking a statistics course and then trying to help fellow students, I noticed one subject that inspires much head-desk banging is interpreting the results of statistical hypothesis tests. It ...
1answer
79 views

### Am I taking crazy pills here or this A/B testing tool's documentation dead wrong?

In the documentation here for a popular A/B testing they say, For example, if you run an A/B testing experiment with a significance level of 95%, this means that if you determine a winner, you ...
1answer
51 views

### Interpretation of the D-statistic from 2-sample KS-tests

I've been using the two sample Kolmogorov-Smirnov test to compare observations from 2018 vs observations from 2019. I heard from my co-worker that you can interpret the D-statistic as the magnitude ...
2answers
7k views

### interpreting confidence intervals in t.test

I'm trying to run a t-test using t.test() but am confused about the p-value and confidence interval. Looking at the output I see a p-value of ~0.03. That leads me ...
1answer
15k views

### Can p-value be greater than 1?

Say I perform Student's t-test: can the p-value be greater than 1? The reason I ask this is that, some say that the p-value is the probability that we will have a Type I error and I would like to ...
5answers
2k views

### What is the relationship between $p$ values and Type I errors [duplicate]

In hypothesis testing we set an accepted level of Type I error probability $\alpha$ and observe whether a sample statistic is equally likely or less likely to be observed if the null hypothesis was ...
3answers
2k views

### Why do we use the chi-squared test to test independence of 2 categorical variables?

I sometimes use the chi-squared test to test the independence of categorical variables. I know how to do the test but don't know the underlying concepts and details. So, I was wondering about the ...
4answers
4k views

### Probability that Null Hypothesis is True

So, this may be a common question, but I’ve never found a satisfactory answer. How do you determine the probability that the null hypothesis is true (or false)? Let’s say you give students two ...
2answers
3k views

2answers
129 views

### Do probabilities for selected type I error **rates** (alpha's) have confidence intervals?

In a journal article, there can be dozens of statistical tests that are unrelated, and, the more tests there are, the greater the likelihood that the probabilities for one of those tests for a given ...

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