The Question asked is are these data valid?

How do you explain if they are?

the objective in later questions is to find if the percentage change in performance rating was significant

ABC Company, Inc. 184 Employees Who Completed a Training Program Intended to Improve Employee Communication Skills. Employees were selected at random from a population of 11,429 and participation was mandatory. 06/11/13 Post-Program # Change in % Change in Date of Performance Performance Employee Years 1 = Female Birthdate Age Rating Rating Rating ID Hire 0.01011983 30.41 01/18/57 56.40 30.04 09/30/62 50.70 05/26/83 75 0.02051983 30.04 02/10/59 54.34 76 02/20/62 51.31 70 71 0.0143 0.03051983 05/26/83 30.04 29.74 07/06/60 52.93 51 50 89 0.0114 0.01111983 11/20/83 11/01/58 54.61 B8 29.41 03/18/60 53.23 74 75 0.0135 0.01011984 to co -0.0122 0.02011984 01/15/84 29.41 04/28/55 58.12 82 81 0.03011984 88 85 0.0341 12/04/50 62.52 84 0.0455 10 0.01021984 02/15/84 29.32 29.28 05/1 1/58 55.08 48 49 0.0208 11 0.01031984 0.01031984 50.23 78 78 12 0.01051984 29 07 53 01 43 44 13 82 83 0.0122 14 0.01061984 06/01/84 29.0 51.9 28.78 54.92 57 56 -0.0175 0.01081984 0.01101984 28.63 55.47 0.02101984 10/30/84 28.61 05/01/49 64.11 64 -0.0625 17 0.0000 18 0.01121984 12/01/84 28.53 52.33 94 94 28.53 77 19 0.02121984 05/01/60 53.11 78 -0.0128 89 85 20 -0.0143 21 0.04121984 28.50 02/15/63 50.32 70 69 0.0488 22 0.04121984 12/20/84 28.48 05/21/66 47.06 52.51 23 12/20/84 2/07/60 94 8/10/59 53.84 63 0.0159 24 0.01021985 02/01/85 28.36 25 0.02021985 28.32 06/06/62 51.01 54 0.0185 26 0.01051985 03/21/58 55.22 86 0.0000 27 15/15/85 28.07 04/28/63 50.12 68 69 0.0145 28 0.01061985 28.03 51.90 08/01/85 27.86 06/18/60 12 98 82 0.0000 29 0.01081985 30 0.02081985 18/15/85 27.82 53.75 94 0.01091985 09/0 1/85 27.78 07/12/60 52.91 68 0.0147 31 -0.0145 32 0.01101985 10/10/85 27.67 02/05/62 51.35 69 33 0.02101985 10/25/85 63 52.05 92 28 8 8 8 8 82828 8 91 34 35 0.02111985 11/18/85 27.56 06/27/57 55.96 60 57 -0.0500 02/18/64 19.31 49 49 0.0000 36 0.01021986 02/05/86 27.35 0.02021986 27.35 50.95 88 37 02/20/86 27.31 76 0.0263 0.03021986 47.82 78 38 72 0.0286 39 0.01031986 27.28 07/19/63 49.89 70 40 0.01041986 27.19 48.86 63 0.0000 04/01/86 93 41 0.02041986 0.03041986 27.15 03/14/63 50.24 78 79 0.0128\f\f\f