Statistics Final- Multiple Choice; CORRECTLY ANSWERED

The median grade is in which of the following intervals? correct answers 60-69 Which of the following is true? correct answers The mean is larger than the median A researcher reports that, on average, participants in this study lost 10.4 pounds after two months on their new diet. A friend of yours comments that she tried the diet for two months and lost no weight. Which of the following statements is then correct? correct answers The report gives only the average. This does not imply that all participants in the study lost 10.4 lbs or even that all lost weight. Your friend's experience does not necessarily contradict the study results. Is it possible to predict a student's score on the midterm exam in a statistics course from the number of hours the student spent studying for the exam? In making a scatterplot to answer this question, the one should correct answers plot time spent studying for the exam on the horizontal axis A study found a correlation of r=-0.61 between the gender of a worker and his or her income. You may correctly conclude correct answers This is incorrect because r makes no sense here Which of the following statements is correct? correct answers Changing the units of measurements of x or y does not change the value of the correlation r A study examined the average grade and teaching evaluation in a large number of courses in order to investigate the effects of grade inflation on evaluations. Results showed higher grades directly corresponded to a more positive evaluation. This means the study found.. correct answers A course grade is positively associated with teaching evaluation A researcher observes that , on average, the number of divorces in cities with major league baseball teams is larger than in cities without major league baseball teams. The most plausible explanation for this observed association is.. correct answers the association is due to the presence of a lurking variable (major league teams tend to be in large cities with more people, hence greater number of divorces) A health club is interested in finding out which of two brands of aerobic exercise equipment provides a more vigorous workout. They purchase 10 machines of each type and for five days between 9 and 12 am they measure the average pulse rate of each person who is working out on one of these 20 machines. This is an example of correct answers an observational study, not an experiment The city council of a suburb of columbus is interested in the level of public support for a new recreation center. The city selects a simple random sample of 50 adult residents and contacts each to determine whether the resident would be interested in joining this recreation center if it