4) Teacher wants to know if giving chocolates in classes increases student motivation and therefore student grades. He uses 3 within subjects design of his PSYC 110 class and obtains the following scores (in %). a) Using the sign test to determine if his chocolates did the trick (a = 0.25). b) What the potential problem with teacher's cutoff level (Le. a)? c) What risk would he run if he used a = 0.0001? No Chocolate Chocolate 65 60 82 84 51 55 48 50 72 75 66 60 71 75 63 65 63 64 90 84