Researchers perform a non-parametric test comparing pain ratings measured on the 10 point visual analogue scale (VAS) between a treatment and control condition. The SPSS output from the test is reported below. Using this output, determine whether there is a statistically significant difference between the groups on VAS pain ratings. Explain your decision. Mann-Whitney Test Ranks Sum of Group N Mean Rank Ranks VAS Control 21 16.67 350.00 Treatment 20 25.55 511.00 Total 41 Test Statistics VAS Mann-Whitney U 119.000 Wilcoxon W 350.000 Z -2.389 Asymp. Sig. (2-tailed) .017 Exact Sig. (2-tailed) .016 Exact Sig. (1-tailed) 008 Point Probability 000 a. Grouping Variable: Group