Satin wants to know if kitchen compost improves the plant growth of her garden. She puts compost in the back half of her garden, but did not put it in the front half of her garden. She measures the height of 15 randomly selected plants in each part of the garden. The results are in the table below. Based on the data, in inches, what can we say about the impact of the compost on the growth of plants in her garden?

Plant heights in the front half: 16,17,19,11,10,13,9,8,14,17,18,12,10,7,16

Plant heights in the back half: 20,19,18,14,15,25,18,22,20,12,26,17,19,20,25