1. "Ha Ha!"- Nelson Muntz Bart Simpson is student of Springfield Elementary School who is known for his mischievous, rebel- lious and "potentially dangerous" attitude. As per academic records Bart is an underachiever while her sister Lisa Simpson excels in study. Class test marks of Bart and Lisa are given in Table 1: Table 1: Class test marks of Bart and Lisa Bart 13, 15, 16, 17, 19, 20, 20, 21, 22, 25, 27, 68 Lisa 33, 33, 35, 35, 35, 35, 36, 40, 45, 46, 52, 70 b) Springfield Elementary School keeps record of all the students performance. Sometimes students miss class tests and the entry is kept blank. i. During mining what problems may arise for this practice? ii. What are the possible solutions for this case? c) Suppose that we plot the Inter-Quartile ranges for attribute D for the + and classes, and we have the plot in Figure 1. Based on this plot, do you think attribute D would be an effective feature for distinguishing between the + and class? Explain why or why not. 0.9 0.8 0.7 0.6 as 0.4 0.3 0.2 + class 2+5 6