The t-test uses the t-distribution (a sampling distribution of t) as a method of model comparison when you are evaluating a complex model against the empty model. It is very similar to using the F-distribution for model comparison, and, actually, the t statistic is the same as the F statistic when you're comparing two groups.
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F test
F test is a method for using the F ratio and F distribution to compare statistical models.
t distribution
T distribution is a probability distribution that is very similar but slightly more variable than the normal distribution. The t distribution has a slightly different shape depending on the degrees of freedom used to estimate . And for very large ...
critical t score
Critical t score is the distance between the boundaries of the "unlikely" area for a t distribution and the mean of that distribution expressed in number of standard deviations; for example, if we assume a sampling distribution is t-shaped, the ...
categorical variable
Categorical variable is a variable for which the values don’t tell us anything about quantity; the values simply tell us which category the object belongs to.
Using the R Sandbox
The R Sandbox The R Sandbox is a separate R window you can use to experiment with R code and play around with ideas from the course. It comes pre-loaded with the base R packages and all of the packages and datasets we reference in the textbook. ...