The following information was obtained from matched samples taken from two populations. The daily production rates for a sample of workers before and after a training program are shown below.Assume the population of differences is normally distributed. 
The null hypothesis to be tested is H0: μd = 0.The test statistic is
Definitions:
Newborn Infant
A very young baby, typically defined as being less than one month old.
Z-Score
A numerical indicator that represents how a specific value compares to the average of a set of values, expressed through the number of standard deviations away from this average.
Standard Deviation
A measure of the amount of variation or dispersion of a set of values, indicating how much the values deviate from the mean of the set.
Free Throw Percentages
A statistical measure in basketball that represents the ratio of free throws made to the total number of free throw attempts.
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