5 The following results were gathered from a survey where three toothpaste brands were tested by three groups. (For example, when 50 people tried Brand A toothpaste for a year, they got zero to one new cavities.) Determine if there is a significant difference in the effectiveness of these toothpastes in preventing cavities. Select the appropriate conclusion. Select one: a. At an alpha of 0.18 there is a significant difference in the effectiveness of these three brands of toothpastes. Brand and cavities are not independent. b. At an alpha of 0.05 there is a significant difference in the effectiveness of these three brands of toothpastes. Brand and cavities are not independent. c. At an alpha of 0.25 there is NOT a significant difference in the effectiveness of these three brands of toothpastes. Brand and cavities are independent. d. At an alpha of 0.18 there is NOT a significant difference in the effectiveness of these three brands of toothpastes. Brand and cavities are independent. Question 6 Assume you are totally unprepared for a quiz, but you decide to take it anyway and just guess at all of the answers. The quiz is 15 multiple-choice questions, each of which has five choices (that's 1 in 5 chances of getting one right). What is the probability that you will pass the quiz if you need at least 9 questions correct in order to pass? Select one: a. 0.0008 b. 0.0001 c. 0.1415 d. 0.1032