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.
13 questions from the last 30 days
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How do I perform a t-test for latent variables in two groups and compare their means?
I’m attempting to conduct a t-test for latent variables in two groups. However, I’m uncertain whether this is the appropriate approach to take.
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Suitable statistical test
I have 2 groups - people that were ever active on my website and people who were never active. Activity is a metric based on some actions - both groups of people visited the website.
Each group used a ...
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Model comparison and experimentation for a thesis result
We are conducting a study to compare the accuracy of two computer vision models:
Model A: Trained on a non-augmented dataset of 11,200 real-world images.
Model B: Trained on an augmented dataset ...
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For a pre-test/post-test setting should I use the raw score, the scaled score, or the standard score to perform Student's t-test?
I'm a bit lost. I'm working on a project that seeks to evaluate the effectiveness of an educational intervention. To do this, a standardized test is applied before and after the intervention with the ...
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Why do the BG test results seem contradictory
I conducted a Breusch-Godfrey (BG) test after performing a regression, and the results showed that the p-value was 0.12, indicating that there is no serial correlation. However, the two-time lagged ...
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Determine the likelihood given random sampling that your samples are actually coming from two distinct sets
In most experiments, you have a control and experimental group. At the end of the study, you run a t-test or similar to determine if the two populations are significantly different from one another. ...
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Paired sample (data) with unequal sample size
I am reading a publication in which the author mentioned that they used the paired t-test. In their study, a questionnaire was provided to a group of people before and after surgery to check the ...
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Calculating false negative rate for a t-test on normally distributed random variables [duplicate]
let's say that I have two random variables, $A$ and $B$. Both are normally distributed, with known means and standard deviations. Let's say the means are different. I am interested in calculating the ...
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Why is a pooled mean necessary in bootstrapping the difference in means?
Formulated Question
In a two-sample bootstrap procedure for testing the difference in means, why is it insufficient to subtract the group-specific mean from each bootstrapped observation (centering ...
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What level of statistical significance to choose for test of equaility of seemingly unrelated regression coefficients?
It is possible to compare effects from models estimated as seemingly unrelated [1] [2] [3]. DVs may be related, IVs may be related, or both may be true. In any event, analysts test for equality of ...
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T-test when variance estimator is not sample variance [closed]
It is well known that if $x \sim \mathcal{N}(0, \sigma^2)$ and we have a sample size of $n$ observations of $x$, the distribution of $\frac{x}{\hat{\sigma}}$, where $\hat{\sigma}$ is the sample ...
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Calculating a confidence interval for a sum of events
I have a trial that contains a set of events, and a bunch of times no event occurred. Each event has a certain magnitude, but the magnitudes of the events follows a reasonable distribution (normal).
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What are the degrees of freedom for performing a 1-sample weighted t-test
I have 7 years of observations relating to mortality experience on a pool of lives. I assume each year's experience is independent of the other years. For each year, we have an expected number of ...
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