The t test for correlated groups requires the sampling distribution of 
be normally distributed.
Definitions:
Mean
The arithmetic average of a set of numbers, calculated by adding them together and dividing by the number of values.
Standard Error
The standard deviation of the sampling distribution of a statistic, measuring its accuracy as an estimate of the population parameter.
Confidence Interval
A range of values, derived from sample statistics, that is likely to contain the value of an unknown population parameter with a specified level of confidence.
Point Estimate
Single value used to estimate an unknown population parameter.
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