8 views

### How to determine if null hypothesis is rejected [closed]

I am conducting an experiment for school in which I am measuring people's heart rates as music plays at different tempos(60, 90, 120, and 150 bpm). The null hypothesis is that the tempo of music has ...
21 views

### What exactly is critical value in statistics? I confuse it with p-value and always get it wrong [duplicate]

I learnt that a p-value lower than the alpha value of 0.05 leads us to reject the null hypothesis and vice versa. It seems to be the opposite for critical values. What then, is this critical value - ...
426 views

### Should I trust the $p$-value in statistical tests?

I got into a debate with my supervisor over a recent paper. The test of correlation in a sample of 77 participants yielded a p-value smaller than 0.05. After removing a few participants (because later ...
33 views

### Logic of Hypothesis Testing [duplicate]

I know that there is something wrong in the following reasoning but I cannot explain it, can you say what is wrong with the following reasoning: Null Hypothesis: The coin is fair (that is, the ...
42 views

### p-value and hypothesis testing [closed]

(The p value) Which one of the statements about the p value is correct? a) The p value is the predefined probability of making a mistake when the null hypothesis is false. b) The p value is the ...
52 views

### i got a very high p-value

i conducted a test to see weather smoking have a relationship with pregnancy period or not and the mean and sd were almost the same between smokers and non smokers moms however i got a high p-value i ...
44 views

### Understanding P-Value with respect to the Level of Significance [duplicate]

The definition of P-value is the probability of obtaining a sample that is more extreme than the ones observed in your data, assuming that the null hypothesis is true. That 's very well-explained in ...
1k views

### interpretation of Hausman test results

I used Hausman test in R in order to decide whether I should use fixed effects or random effects model. This is the result I got: Hausman Test data: Deviation ~ Concentration chisq = 1.721, df = 1,...
36 views

### How to tell if my mean values are not significantly different? [duplicate]

I am looking to test if two mean and standard deviation values I obtain are not significantly different (comparing a sensor method to the gold standard). I am planning on using a two-tailed t-test in ...
50 views

### intuition/logic behind comparing p-value and significance level [duplicate]

I'm new on this forum and I hope that this is not already asked. My question is this: I know that the p-value is defined as $p=P($obtaining sample as or more contradictory to $H_0$ then the one ...
15 views

### Hypothesis test practice question

" Prof. J conducts a hypothesis test on whether the proportion of all students who bike to school (denoted as p) equals 30%. Specifically, Prof. J has H0: p=0.3 versus HA: p≠0.3. He obtains a P-value ...
53 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 ...
238 views

### How to test if “previous state” has influence on “subsequent state” in R

Imagine a situation: We have historical records (20 years) of three mines. Does the presence of silver increases the probability of finding gold in next year? How to test such question? Here is ...
### Why is the p-value defined as $P = F(T)$ or $P = 1 - F(T)$ when the null hypothesis is true?
I'm having trouble with the theoretical definition of the p-value. Let $T$ be a test statistic with CDF $F(T)$ and supose the null hypothesis is true. If we were to reject the null hypothesis for ...