Data contains the prices for 48 ladies' diamond rings and the carat size of their diamond stones. The rings are made with gold of 20 carats purity and are each mounted with a single diamond stone. A regression is run to predict the price of the ring based on the carat size of the diamond. Variable DF Parameter Estimate Standard Error t Value P-value Intercept 1 -259.62 carat size 1 3721.02 17.32 81.79 -14.99