This data shows the number of employee injuries reported in the first 50 days after a new device training session in each of the 4 production Plants of a certain company across the world.

a) Assuming a significance level of 0.05, is there any significant difference in the injuries reported between these 4 Plants?

b) The manager is particularly concerned about the results from Plant 1 compared to Plant 3. Is there evidence that the injury level at this Plant is significantly different from that of Plant 3?