In order to determine whether the median distance for the X-Special golf ball exceeds the median distance for the best-selling golf ball, six golfers were selected and asked to hit each ball with their driver. The distance was recorded. The following data were observed. 
Based on these data, and testing at an alpha = 0.025 level, the critical value for the Wilcoxon Matched Pairs Signed Rank test is 2.
Definitions:
Norm Group
A representative sample of the population by which test scores are interpreted and compared.
Normally Distributed Curve
A graphical representation of a distribution of data in which most values cluster around a central peak and taper off symmetrically towards either end, resembling a bell shape.
Standard Deviation
Standard deviation is a statistical measure that quantifies the amount of variation or dispersion of a set of data values from the mean.
Stanine
A method of scaling test scores on a nine-point standard scale, where a higher stanine score indicates better performance.
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