Peak force (N) on the hand was measured just prior to impact and just after impact on a backhand drive for six advanced tennis players. The resulting data, from a paper are given in the accompanying table. Use the signed-rank test to determine if the mean postimpact force is greater than the mean pre- impact force by more than 6.

Player Preimpact Postimpact 26.7 38.2 44.3 47.2 53.9 61.0 aUAWNE 26.4 34.3 47.6 64.9 43.1 44.2