Actions to improve the repair time of equipment used to produce electronic components were taken two years ago. The average repair times per month since then are: 4.1, 3.2, 5.1, 6.2, 4.7, 4.5, 3.8, 2.5, 4.7, 5.3, 1.7, 1.3, 4.3, 4.4, 2.7, 2.2, 2.1, 1.8, 2.3, 2.5, 3.1, 2.7, 2.5, 2.1 Do these data indicate that the improvement actions were effective? Provide the rationale for your answer