Examlex
A correlation coefficient of zero can be obtained even when there is actually a meaningful relationship between two variables (e.g.,data is collected when there is only slight variation in one of the variables).
T-test
A statistical test used to compare the mean of two groups to see if there is a significant difference between them.
Null Hypothesis
The hypothesis that there is no significant difference between specified populations, any observed difference being due to sampling or experimental error.
Alpha
The threshold of probability at which the null hypothesis is rejected in statistical testing, often set at 0.05.
Statistical Significance
Indicates the likelihood that a result or relationship is caused by something other than mere chance.
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