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MA260 Statistical Analysis Online Exam 6 Answers (Ashworth College)

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anana - banana chocolate bar - licorice stick licorice stick - licorice stick chocolate bar – banana banana - licorice stick licorice stick - banana banana - chocolate bar Find the probability that no chocolate bar was eaten. A. 4/9 B. 5/9 C. 7/9 D. 5/8 Question 4 of 40 5.0/ 5.0 Points A study of two types of weed killers was done on two identical weed plots. One weed killer killed 15% more weeds than the other. This difference was significant at the 0.05 level. What does this mean? A. The improvement was due to the fact that there were more weeds in one study. B. The probability that the difference was due to chance alone is greater than 0.05. C. The probability that one weed killer performed better by chance alone is less than 0.05. D. There is not enough information to make any conclusion. Question 5 of 40 5.0/ 5.0 Points In a poll, respondents were asked whether they had ever been in a car accident. 220 respondents indicated that they had been in a car accident and 370 respondents said that they had not been in a car accident. If one of these respondents is randomly selected, what is the probability of getting someone who has been in a car accident? Round to the nearest thousandth. A. 0.384 B. 0.380 C. 0.373 D. 0.370 Question 6 of 40 0.0/ 5.0 Points A study of 600 college students taking Statistics 101 revealed that 54 students received the grade of A. Typically 10% of the class gets an A. The difference between this group of students and the expected value is not significant at the 0.05 level. What does this mean in this case? • A. The probability that the difference occurred due to chance is less than 0.05. B. The probability of getting an A is 10% and only 9% got an A in this study. The difference is less than 5% so it is not significant. C. There is not enough information to make any conclusion. D. The probability that the difference occurred due to chance is more than 0.05. Question 7 of 40 5.0/ 5.0 Points The data set represents the income levels of the members of a country club. Estimate the probability that a randomly selected member earns at least $98,000. 112,000 126,000 90,000 133,000 94,000 112,000 98,000 82,000 147,000 182,000 86,000

105,000 140,000 94,000 126,000 119,000 98,000 154,000 78,000 119,000 A. 0.4 B. 0.6 C. 0.66 D. 0.7 Question 8 of 40 5.0/ 5.0 Points A sample space consists of 46 separate events that are equally likely. What is the probability of each? A. 1/24 B. 1/46 C. 1/32 D. 1/18 Question 9 of 40 5.0/ 5.0 Points A bag contains 4 red marbles, 3 blue marbles, and 7 green marbles. If a marble is randomly selected from the bag, what is the probability that it is blue? A. 2/11 B. 3/11 C. 5/14 D. 3/14 Question 10 of 40 0.0/ 5.0 Points A die with 12 sides is rolled. What is the probability of rolling a number less than 11? Is this the same as rolling a total less than 11 with two six-sided dice? Explain. A. 2/6 B. 3/6 C. 4/6 D. 5/6 Question 11 of 40 5.0/ 5.0 Points Based on meteorological records, the probability that it will snow in a certain town on January 1st is 0.413. Find the probability that in a given year it will not snow on January 1st in that town. A. 0.345 B. 0.425 C. 0.587 D. 0.592 Question 12 of 40 5.0/ 5.0 Points A class consists of 50 women and 82 men. If a student is randomly selected, what is the probability that the student is a woman? A. 32/132 B. 27/66 C. 50/132 D. 82/132 Question 13 of 40 5.0/ 5.0 Points If you flip a coin three times, the possible outcomes are HHH, HHT, HTH, HTT, THH, THT, TTH, TTT. What is the probability of getting at least two tails? A. 1/2 B. 2/3 C. 3/4 D. 4/9 Question 14 of 40 5.0/ 5.0 Points Suppose you buy 1 ticket for $1 out of a lottery of 1000 tickets where the prize for the one winning ticket is to be $500. What is your expected value?

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