I need answer only for the part the (d) What is the estimated difference in price (on average) between diamond rings with diamonds that weigh 0.27 and 0.36 carat?

Weight (carats)	Price (dollars)
0.18	399
0.22	550
0.37	1143
0.12	168
0.3	888
0.31	880
0.22	599
0.37	1068
0.23	590
0.15	258
0.33	966
0.11	182
0.39	1135
0.34	1038
0.3	892
0.26	670
0.36	1040
0.25	686
0.25	669
0.37	1063