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# Questions tagged [hypothesis-testing]

Hypothesis testing assesses whether data are inconsistent with a given hypothesis rather than being an effect of random fluctuations.

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23 views

### Analysis of pre and post treatment

I have the following data: A random group of patients with a certain disease who receive a drug at a certain time. Dose of the drug given to the patient. This drug has an affect to the heart which ...
235 views

### Difference/relationship between power and significance

What is the conceptual difference between statistical power and statistical significance? Are they the same? Is one used for the other?
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### Random Coefficient Model [on hold]

Recently I am learning the random coefficient model or random slope model. Have got the rough idea of the model, it will produce the overall estimation and variance for the random variable. However, I ...
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### Why did they halve their $\chi^2$ statistics in this article?

I was reading this article and tried to find their results regarding the $\chi^2$ tests displayed in table 2 on page 4. These are $\chi^2$ tests of data from the table 1 on page 3. However I did not ...
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### which is the statistical test to use between metric groups?

I'm quite new to Statistics, so I have to write my bachelor thesis till December and my tests were all wrong, so I'd be happy if you could help me. I want to analyse if there's a connection between ...
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### Question on this study design

If I'm looking to run a randomized controlled experiment comparing: Group A) control Group B) treatment 1 Group C) treatment 2 Group D) a combination of treatments 1 and 2 1) Can I reduce ...
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### How to determine if null hypothesis is rejected [on hold]

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 ...
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### Statistical approach to differences in proportions between groups

I have performed an eye-tracking experiment where two groups of subjects looked at three pictures. Then I calculated how much of the time each subject spent looking on each picture (in %), giving me ...
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### Sphericity fort t-test

In my statisticus course I can remember that an ANOVA requires normality AND sphericity (homogenous variance). Violation of the latter can be compensated for with a Greenhouse-Geiser correction. A ...
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### Do I assume Equality of variances for a paired t test

I’m doing a paired t test and was just wondering if I assume equality of the variance and why I would or wouldn’t
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### Question about simple inference on Bernoulli trials

Suppose we have these two sequences of 10 independent coin flips: HTTHHTTHHT HHHHHHHHHH And suppose we want to test wether the coin is balanced or not (let $p=P(H)$). Under $p=\frac{1}{2}$ both ...
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### Use of the Wilcoxon rank-sum test on two samples where the elements of one sample make up some of the elements of the other? [closed]

I have two samples to compare and I want to determine if they are statistically similar or different. Both are measurements of the same property on the same material. Lets say X contains 25 elements ...
22 views

### independent t-test alternatives for unequal sample size

I tried implementing an independent t-test (alpha = 0.05) using excel for male(n=20) and female(n=25) scores. However, excel doesn't allow it. Are there alternative tests for comparing the two samples?...
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### Performing a hypothesis test on data that is not exact

So I am trying to perform a hypothesis test to see if there is a linear relationship between two variables in specific gpa and attendace. Unfortunately our results are not exact, i.e they consist of a ...
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### Portmanteau Test for VAR

I am new into working with VAR models and have a fundamental question regarding model diagnostics. As suggested in Kilian and Lütkepohl (2017, pp. 52-53), I would like to run a Portmanteau test for ...
17 views

### The McNemar exact conditional test: should the p-values be uniform under the null?

I have two classification models, $C_1$ and $C_2$, and I want to do a hypothesis test to see if $C_1$ is significantly better than $C_2$. I am interested in a one-sided hypothesis test. Thus I have ...
34 views

### What statistical test to use when X & Y are different sizes and Y contains all of the observations from X, plus some extra ones? [closed]

I want to determine whether two groups of observations are statistically significantly different (or similar). However, the number of observations in both groups is different. For example, X has N=25 ...