If a random sample of size n is drawn from a normal distribution,then the standardized
variable t = ( 
- μ)/ (s/ 
)has a Student's t-distribution with n-1 degrees of freedom.
Definitions:
T Test
A statistical test used to compare the means of two groups and determine if there are statistically significant differences between them.
Pooled Standard Deviation
A method for calculating the overall standard deviation from multiple samples or groups, combining variances to assess overall variability.
Cohen's D
A measure of the standardized difference between two means, commonly used in the context of effect size in statistics.
Effect Size
A quantitative measure of the magnitude of the difference between groups or the size of a relationship between variables.
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