QUESTION 2 A box contains a large number of red and blue marbles; the proportion of red marbles is known to be 80%. You are drawing at random from the box. Which of the following is incorrectly paired? O A. box - population O B. draws - sample O C. proportion of red marbles in the box - sample proportion O D. number of draws - sample size QUESTION 3 On average, elephants weigh 2.5 tons with an SD of 1 ton. Suppose 100 elephants are to be transported on a cargo ship. We expect their total weight to be around x give or take y, where O A. X = 250 tons, y = 10 tons O B. X = 100 tons, y = 10 tons O C.x = 2.5 tons, y = 1 ton O D. X = 250 tons, y = 100 tons QUESTION 4 A political party sends a mail survey to 1,500 randomly selected registered voters in a district. The survey asks respondents to give an opinion about the job performance of the current President. Of the 1,500 surveys sent out, 480 are returned, and of these, only 120 say they're satisfied with the President's job performance. This is an example of O A. a survey with little bias because 1,500 voters represent an important part of this district. O B. a survey containing selection bias. O C. a survey with little bias since people understand whether they approve of the President's job performance. . D. a survey containing non-response bias.QUESTION 5 Rory asks 100 randomly chosen UTD students whether they have watched "Avengers: Infinity War". In her survey, 30% of them are reported to have watched the film. Meanwhile, Luke asks 400 randomly chosen UTD students whether they have watched the film. In his survey, 20% of them are reported to have watched the film. Suppose both Rory and Luke increase their sample sizes to 1000. They observe that the percentages they get become closer each other. This is explained by O A. Selection bias O B. Central limit theorem O C. Independence between both surveys O D. Law of averages QUESTION 6 A surveyor randomly selected 50 students who were studying in the UTD library and found that 90% of these students were in favor of longer library hours. The results of this study, if applied to all UTD students, are questionable because of O A. response bias. O B. chance error. O C. nonresponse bias. D. selection bias. QUESTION 7 To estimate the average education levels of Latinos in Dallas, I choose five neighborhoods with high proportion of Latinos. I ask 100 Latinos in these neighborhoods about their education level and calculate their average educational level. Can we make our estimate more accurate? O A. No, the estimate is free of bias. O B. Yes, by taking a larger sample from the five neighborhoods. O C. Yes, by including in the sample few more neighborhoods with high proportion of Latinos. O D. None of the above.QUESTION! A fair coin is tossed multiple times. You win if the number of heads = the number of tails. There are two lotteries to choose from: Lottery (1 ); Tossing 2 times You win if # of heads =1. Lottery (2): Tossing J 000 times. You win if # afheads =500. O Dram-1y (1) QUESTION9 A box contains a large number of red and blue marbles; the proportion of red marbles is known to be 80%. A simple random sample of 100 marbles is drawn from the box. What is SE of the sample proportion o red marbles? O (10.04 QUESTION 10 A box contains a large number of red and blue marbles; the proportion of red marbles is known to be 80%. You are drawing at random from the box. Which of the following is TRUE as the number of draws goes up? 0 A. While the SE for the number of red marbles in the sample goes down, the SE for the percentage of red marbles goes up. 3- While the SE for the number of red marbles in the sample goes up, the SE for the percentage of red marbles goes down. 0 C. Both the SEs for the number and percentage of red marbles in the sample go down. 0 D-Both the SEs for the number and percentage of red marbles in the sample go up