B4. My father has trouble with his throat and nds that sucking on candy makes it feel better. He keeps a variety of candy in a bowl by his bed. His favorite candy is Werthers. However, he also has Halls, Ricolla and Kabaya. At night he never turns on the light on to look for his favorite candy he just reaches into the bowl in the dark (i.e. his candy selection is essentially random). If he began the night with 13 Werthers, 15 Halls, 8 Ricolla and 12 Kabaya, and eats 3 candies during the evening, what is the probability that he would select at least 1 Werthers? (5 marks) Answer = .6216 B5. It is a commonly accepted \"fact\" that when you are in a hurry 78% of trafc lights turn red as you approach them, but when you have lots of time only 33% will be red. If there are 7 trafc lights between your house and school and you are late for a class (i.e. in a hurry), what is the probability that at least 6 of them will be red? (6 marks) Answer = .5225 B6. You run a study looking at the relationships among the number of computers sold in various stores, the amount of money they spend on advertising and the size of the store. You get the following correlations 'om 14 stores. Advertising Number sold Size of store Advertising 1.00 .77 .26 Number sold .77 1.00 .60 Size of store .26 .60 1.00 If you were to predict computer sales om amount of money spent advertising and size of the store, a) what would R2 be? (4 marks) .7643 b) what would R be? (1 mark) .8743 c) How much more variance in sales can you account for using both variables compared to just size of the store? (2 marks) answer not shown