A repeated measures experiment investigates if people can tickle themselves.  A mean difference of 3.04 milliseconds is found between the Tickled By Self (485.17ms) and Tickled By Experimenter (482.13ms) means for 9 participants (NB: conditions were counterbalanced).  The sum of squares value was 110.40.  What is the appropriate test statistic and what it its critical value (applying α = 0.05)?       t ; 2.365       r; 1.96       z; 2.307       t; 2.307

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