The following information was obtained from matched samples. The daily production rates for a random sample of workers before and after a training program are shown below. Worker 123 4 597 6 Before 18 23 25 21 20 18 15 After 20 21 25 18 23 17 16 The null hypothesis to be tested is Ho: d = o using a 0.05 level of significance. Based on the results of this hypothesis test, state your conclusion.