121k views

“Accept null hypothesis” or “fail to reject the null hypothesis”? [duplicate]

I'm trying to conduct a Student's t-test for a table of values while trying to follow the explanation and details found on this website. I understand that if the p-value is <.01 then it's really ...
2k views

Can a null be inconclusive? [duplicate]

My Null for the T-test is h0: -tcritical < Tstat < +tcritical I would like a confidence level of 95%. If my empirical result satisfies the null, but not my confidence requirements (the p ...
218 views

Hypothesis Testing terminology [duplicate]

I am studying now Hypothesis Testing. I use for it book High-Yield Biostatistics, Epidemiology, and Public Health and videos of Brandon Foltz (recommending these ...
41 views

How to test hypotheses properly? [duplicate]

I have a homepage which I would like to change in some ways. I would like to place a commercial banner on it Ha. In this regard, I dont want the change to affect ...
38 views

Confidence interval for odds ratio only just containing 1 [duplicate]

If I have an odds ratio of 1.2 say between group A and group B but a confidence interval of (0.99,1.5) which only just about contains 1. Can I make the conclusion that there is no association between ...
27 views

Setting the conventional null hypothesis as the alternative? [duplicate]

I am a bit confused on assigning null and alternative hypotheses. For example in comparing 2 interventions, conventionally, null hypotheses are usually stating that there are no differences in ...
24 views

Is it appropriate to use paired t-test for comparing two means from the same sample obtained from two different methods? [duplicate]

I want to determine if method A provides the same results as method B. I obtain 2 sets of measurements using both method A and B. I therefore have 2 means that I want to compare using the paired t-...
15k views

If we fail to reject the null hypothesis in a large study, isn't it evidence for the null?

A basic limitation of null hypothesis significance testing is that it does not allow a researcher to gather evidence in favor of the null (Source) I see this claim repeated in multiple places, but I ...
6k views

Why is the null hypothesis often sought to be rejected?

I hope I am making sense with the title. Often, the null hypothesis is formed with the intention of rejecting it. Is there a reason for this, or is it just a convention?
18k views

Is it possible to prove a null hypothesis?

As the question states - Is it possible to prove the null hypothesis? From my (limited) understanding of hypothesis, the answer is no but I can't come up with a rigorous explanation for it. Does the ...
3k views

Justification of one-tailed hypothesis testing

I understand two-tailed hypothesis testing. You have $H_0 : \theta = \theta_0$ (vs. $H_1 = \neg H_0 : \theta \ne \theta_0$). The $p$-value is the probability that $\theta$ generates data at least as ...
19k views

Now that I've rejected the null hypothesis what's next?

I've time and again rejected or failed to reject the null hypothesis. In the failure to reject case, you conclude that there isn't sufficient evidence for rejection and you "move on" (i.e., either ...
11k views

GLM: verifying a choice of distribution and link function

I have a generalized linear model that adopts a Gaussian distribution and log link function. After fitting the model, I check the residuals: QQ plot, residuals vs predicted values, histogram of ...