Ithink it's a-b squared. am i right? how would i type that in the answer box? would i just type in the word minus or just "-"

Arandom high school question but a hard one

Amajor grocery store chain is trying to cut down on waste. currently, they get peaches from two different distributors, whole fruits and green grocer. out of a two large shipments, the manager randomly selects items from both suppliers and counts the number of items that are not sell-able due to bruising, disease or other problems. she then makes a confidence interval. is there a significant difference in the quality of the peaches between the two distributors? 95% ci for pw-pg: (0.064, 0.156)

50 points~ ! i have to turn this in tomarrow