6.3 A chemical engineer is looking for a relationship between the amount of catalyst added to a chemical reaction and the percent yield. She adds different amounts of catalyst (measured in g) to four different batches and measures the percent yield as summarized in the table below. Find the least-squares regression equa- tion and use it to predict the yield if the amount of catalyst is 1.1 g. Use R. catalyst X 10.8 1 1.2 1.4 yield y 19.68 25.93 29.23 33.52 none of these -2.439+20.41x, .1) 24.89 -2.439+23.41x, .1) 28.19 2.439+22.41x, . 27.09 -2.439+21.41x, Vi.1) 25.99