 Mar 2023

www.statology.org www.statology.org

Some people argue that the Welch’s ttest should be the default choice for comparing the means of two independent groups since it performs better than the Student’s ttest when sample sizes and variances are unequal between groups, and it gives identical results when sample sizes are variances are equal. In practice, when you are comparing the means of two groups it’s unlikely that the standard deviations for each group will be identical. This makes it a good idea to just always use Welch’s ttest, so that you don’t have to make any assumptions about equal variances.
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 Jan 2023

www.investopedia.com www.investopedia.comTTest1

TTest: What It Is With Multiple Formulas and When To Use Them
https://www.investopedia.com/terms/t/ttest.asp A ttest is an inferential statistic used to determine if there is a significant difference between the means of two groups and how they are related. Ttests are used when the data sets follow a normal distribution and have unknown variances, like the data set recorded from flipping a coin 100 times.
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www.scribbr.com www.scribbr.com

An Introduction to t Tests  Definitions, Formula and Examples
How to TTEST

 Apr 2022

www.graphpad.com www.graphpad.com

difference between SD and SEM


towardsdatascience.com towardsdatascience.com

In this case, for a test to be statistically significant, pvalue must be lower than 0.05.
statistical significance should be less than 5%
tf your confidence that the results are not due to chance is 95%


www.stat.colostate.edu www.stat.colostate.edu

We are 99% confident that the true average “attitude” difference betweenliving environments is between 1.32 and 7.88. At a significance level of 0.01we can say that living in a minority environment is associated with higherscore
99% confident that the true average (result) is between these two numbers;
at 1% (0.01) significance, we can scientifically assume there is a causal relationship

 Jan 2022

sheetstutorial.com sheetstutorial.com

How to do t test in google sheets
Ttest tutorial

 Feb 2021

twitter.com twitter.com

ReconfigBehSci. (2020, November 21). RT @DrEricDing: Good question for immunologists like @michaelmina_lab @VirusesImmunity and @PeterHotez. Https://t.co/Rs1zaUPznm [Tweet]. @SciBeh. https://twitter.com/SciBeh/status/1334804615842439170

 Dec 2020

www.investopedia.com www.investopedia.comTTest1

Essentially, a ttest allows us to compare the average values of the two data sets and determine if they came from the same population.
Comparing datasets to see if they came from the same population.
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 Oct 2020

www.ibm.com www.ibm.com

The GROUPS subcommand specifies an unknown variable or a long string variable.
The GROUPS subcommand specifies an unknown variable or a long string variable.
