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Pooled-variances T-test
A statistical method used to compare the means of two groups, assuming that the two populations have equal variances.
Rejection Region
In hypothesis testing, it is the range of values for which the null hypothesis is rejected in favor of the alternative hypothesis.
Additives
Substances added to products to improve or preserve them.
Significance Level
The probability of rejecting the null hypothesis in a statistical test when it is true, commonly denoted by alpha.
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