# Questions tagged [t-test]

A test for comparing the means of two samples, or the mean of one sample (or even parameter estimates) with a specified value; also known as the "Student t-test" after the pseudonym of its inventor.

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20 views

### How to compare two groups of discrete states?

The dataset includes 25 patients in one group (low intensity of a certain parameter) and 27 people in another group (high intensity of the same parameter). One or more teeth were treated for each ...
18 views

### Is the intercept term in a simple linear regression a nuisance parameter when we want to test whether the slope is different from zero?

Assume that I cannot use least-squares estimator, so I don't have the intercept and the slope and only know one parameter at a time. Is the intercept term in a simple linear regression a nuisance ...
5 views

### Technical efficiency measurement using Tobit model

I want to measure the technical efficiency of layer poultry farmers producers using the Tobit model. but I collected the data and enter the excel sheet to import it into STATA 13. Now I am confusing ...
24 views

### Which statistical test should I use to compare two models (multiple runs) on the same (big) dataset?

I want to compare the performance of two stocastic models on the same datasets (>10k samples). To this end, I run 5 runs for each model (different seed) and I can compute the mean and std for each ...
8 views

### Are there restrictions on the use of modified Thompson Tau?

I've been running an experiment in which I apply Modified Thompson-Tau to samples drawn from a standard normal distribution, the goal being to understand how $\alpha$ and the sample size [draw_size in ...
232 views

### Hypothesis testing of two dependent samples when pair information is not given

For two samples equal sample size $(n\ =\ 100)$ that are randomly selected and dependent, only the sample means$(\overline x_1, \overline x_2)$ and sample standard deviations($s_1,s_2$) for both ...
1 vote
51 views

### Justification for conducting independent samples t test on non normal data

I've conducted a study comparing two different teaching strategies in two different sections of the same class; I gave participants in both classes the same 5 tests and wanted to see if test grades in ...
23 views

### Need equality of variance test between control and experimental conditions on a within subjects with replication dataset

I have some proteomics data of 16 biological replicate samples split between 8 control and 8 knockdown. One of the tests I wanted to do was to see if the knockdown impacts the variance of the protein ...
1 vote
26 views

### One sample t-test equivalent for repeated measures design

I might be looking for something fairly obvious but here is my setup: I have one group of participants who will perform multiple (different) tasks in an experiment. For each one of the tasks, I want ...
8 views

### Statistic tests in "table 1" - which to choose?

I have made a table overall comparing two cohorts - a "table 1". The table includes gender, age and 2 different scores from the two cohorts. I would like to test if gender, age and the 2 ...
10 views

### Improving A/B test with additional variable (time spent)

I have a typical example of A/B testing where we want to investigate the change in user behaviour after having tested a new website design on a specific group of users. The metric that we're using (...
17 views

### Do I need to apply Bonferroni Correction?

In my study I wish to perform three paired t-tests. The study compared times recorded to complete a test from before and after an intervention. The test is split into two parts (A and B) and the time ...
40 views

### Reporting the results of a continuous moderating variable on a categorical independent variable

I'm working with a dataset that was collected to test the following [adapted] research question: Does listening to music (categorical x; 2 conditions: pre_music - post_music) affect test scores (y; ...
44 views

### How can I choose between homoscedastic and heteroscedastic

I want to calculate the p-value between subgroups of my samples. For that, I am using the T.TEST function of Excel. But I do not understand the last parameter, type: Paired Two-sample equal variance (...
1 vote
17 views

### Hochberg/Bonferonni correction for multiple one-sample t test

I am trying to conduct a content validity analysis where I want to test if a certain item (e.g. a question) can be related to a certain construct (e.g. depression). I've let people fill in a ...