0 Question 3 B on pt '0 2 G) Details A study collects information on the following variables from drivers: number of miles driven since your last fill up, gallons of gas remaining in your tank. We wish to create a scatterplot illustrating the relationship between the two variables. Which variable would you use as the explanatory variable? 0 number of miles driven since your last fill up 0 gallons of gas remaining in your tank Which variable would you use as the response variable? 0 number of miles driven since your last fill up 0 gallons of gas remaining in your tank Would you expect to see a positive or negative association between the two variables? 0 positive 0 negative 0 neither 0 Question 5 3 0H pt '0 2 G) Details A 2011 Gallup survey based on telephone and face-to-face interviews with 4,220 adults in China, aged 15 and older suggests that 30% smoke regularly or occasionally. The following is also noted "one can say with 95% confidence that the maximum margin of sampling error is 2.2 percentage points". Which of the following is true based on the results of this survey? 0 We are 95% confident that 25.6% to 34.4% of all Chinese adults smoke. O Exactly 30% of all Chinese adults smoke. 0 We are 95% confident that 27.3% to 32.2% of all Chinese adults smoke. 0 If we were to randomly sample another group of 4,220 Chinese adults we would find that exactly 30% of them smoke as well. 0 If the sample size was larger, the margin of error would be larger as well. 0 Question 19 B 0! 3 pts '0 2 (D Details 6.18 Is college worth it? Part II: Exercise 6.16 presents the results of a poll where 43% of 331 Americans who decide to not go to college do so because they cannot afford it. (a) Calculate a 90% confidence interval for the proportion of Americans who decide to not go to college because they cannot afford it, and interpret the interval in context. lower bound: :] (please round to four decimal places) upper bound: :] (please round to four decimal places) Interpret the confidence interval in context: 0 We can be 90% confident that the proportion of Americans who choose not to go to college because they cannot afford it is contained within our confidence interval 0 90% of Americans choose not to go to college because they cannot afford it 0 We can be 90% confident that our confidence interval contains the sample proportion of Americans who choose not to go to college because they cannot afford it (b) Suppose we wanted the margin of error for the 90% confidence level to be about 1.5%. How large of a survey would you recommend? A survey should include at least :] people. 0 Question 20 B 0! 3 pts '0 2 G) Details Suppose that 61% of people own dogs. If you pick two people at random, what is the probability that they both own a clog? Give your answer as a decimal (to at least 3 places) or fraction