Question 1(Multiple Choice Worth 3 points) [:3 (02.02 MC) Monthly private school tuition based on the average number of weeks in attendance is predicted using the leastsquare regression line, )7 = 265.9 + 93.4x, where )7 represents the predicted monthly expense and x represents the average number of weeks in attendance. Achild attends private school an average of 3.5 weeks and has a monthly cost of $595. What is the residual for the child? 0 2.2 O 3.52 02.2 0 3.52 O 90.7 Question 2(Multiple Choice Worth 3 points) if:J (02.01 MC) Afood distributor conducts regular surveys of consumer spending on its products. The average weekly household spending (in dollars) on regular pasta and gluten-free pasta for each of 12 states was recorded. A scatterplot of spending on regular pasta versus gluten-free pasta is shown. Which of the following statements is true? 12 10 O I GlutenAFree Pasta G' O 0 1 2 3 >1 5 6 7 8 Regular Pasta O Point (7.2. 10) is an outlier. Q There is clear evidence of a negative association between spending on gluten-free pasta and regular pasta. 0 The equation of the leastsquares regression line for this plot is approximately 9 = 3.8 + Ex . O The correlation for these data is r= 1. O The observation in the upper right corner of the plot is influential for the least-squares regression line. Question 3(Multiple Choice Worth 3 pOints) if:j (01.06 LC) The weight of laboratory grasshoppers follows a Normal distribution, with a mean of 90 grams and a standard deviation of 2 grams. What percentage of the grasshoppers weigh between 86 grams and 94 grams? 0 99.7% 0 95% O 68% O 47.5% 0 34% Question 4(Multiple Choice Worth 3 pomts) if:j (03.05 MC) A researcher wants to know how dog owners in the United States feel about establishing a law requiring individuals who own pit bulls to obtain insurance for their dog. The researcher mails a survey to a random sample of 5,000 owners out of all registered dog owners in the US. Atotal of 2,389 out of the 5,000 respond and 22% say they favor the law. Which of the following is true based on this information? Q There is sufficient evidence that the percentage of all dog owners who say they favor insurance for pit bulls is close to 22% because random sampling was used. 0 There is sufficient evidence that the percentage of all dog owners who say they favor pit bull owners obtaining insurance for their dog is close to 22% because less than half ofthose who were mailed the survey responded. O The results of this survey are invalid because the survey was mailed and not a face-to-face interview. 0 There is evidence of nonresponse bias in the survey results. 0 There is strong evidence of convenience response bias in the survey results. Question 5(Multiple Choice Worth 3 points) (03.05 LC) A researcher wants to conduct a study to see if healthy eating habits improve mood. The researcher finds 25 individuals who eat healthy and 25 that do not. Each of the 50 individuals are given a questionnaire to determine mood. If the 50 individuals did not know they were participating in the study, which statement about the study is correct? 0 It is an experiment where eating habits is a blocking variable. 0 It is a doubleblind study. 0 It is an observational study. Q It is a matched-pairs design. 0 It is a randomized experiment. 1C1 Question 5(Multiple Choice Worth 3 points) (01.03 LC) Xavier wants to compare two websites based on customer ratings in order to decide on which website to make a big purchase. He creates a boxplot for each website with the same number of ratings. I Website A I Website 8 70 50 Rating 40 20 10 What can Xavier NOT conclude? 0 Website A has a higher median rating. 0 Website A has a larger interquartile range. 0 Website A has a larger range. 0 Website A has a lower median rating. 0 Website A has a lower first quartile value Question 7(Multiple Choice Worth 3 points) if:1 (02.04 LC) The mean and standard deviation for mileage of used cars on a local car lot are )'