This regression uses the number of times a new worker has spent practicing task (measured in Number Practice~Rounds) to predict how much time is needed to complete one round of the task (measured in Minutes). What is the equation of the least-squares regression line? 
选项为:A:$\overset{\frown}{Rounds}=-0.6442+22.94\textbackslash{} Minutes$  B:$\overset{\frown}{Rounds}=22.94+0.5466\textbackslash{} Minutes$  C:$\overset{\frown}{Minutes}=22.94+2.866\textbackslash{} Rounds$  D:$\overset{\frown}{Minutes}=22.94-0.6442\textbackslash{} Rounds$  E:$\overset{\frown}{Minutes}=-0.6442+0.5466\textbackslash{} Rounds$  请回答其中一个选项.