In the past, the Algood Company has produced an average of 12,000 good parts per day. Since the compensation system was changed 15 days ago, the average production has been 12,100 good parts per day. The sample standard deviation of the number of good parts produced during the last 15 days is 400. Is this sufficient evidence to conclude, at the α ⇄ 0.10 level, that the new compensation plan has improved productivity? Justify your answer with a p-value.