(02.05 MC)  You want to know the opinions of dog owners across America on the issue of establishing a law requiring individuals who own pit bulls to obtain insurance for their dogs. You obtain a list of all registered dog owners and mail a survey to a random sample of 5,000 owners. Of those, 2,389 responded and 22% say that they favor the law. Which of the following statements is true? (5 points)

(01.06 MC)  The masses, in kg, of some bags on an airplane are shown below: 7, 6.2, 6.1, 6.8, 6.1, 6.2, 6.8, 5.8, 6.2, 6.3 Jack made the following box plot to represent the masses: Which of the following did Jack incorrectly show on his box plot? (5 points)

(01.02 LC)  A survey was taken of students in math classes to find out how many hours per day students spend on social media. The survey results for the first-, second-, and third-period classes are as follows: First period: 2, 4, 3, 1, 0, 2, 1, 3, 1, 4, 9, 2, 4, 3, 0 Second period: 3, 2, 3, 1, 3, 4, 2, 4, 3, 1, 0, 2, 3, 1, 2 Third period: 4, 5, 3, 4, 2, 3, 4, 1, 8, 2, 3, 1, 0, 2, 1, 3 Which is the best measure of center for third period and why? (5 points)

(02.05 MC)  A dentist office gives a survey to all wisdom teeth extraction patients asking them to rate the quality of their dental experience. One month after wisdom teeth extraction, the dentist contacts the patients again to ask if there were any complications from the extraction. Last year, the results of the surveys showed that of the patients who had a poor dental experience, 37% had post-extraction complications. What conclusion can be drawn from this study? (5 points)

(02.01 MC)  The HR manager of a water-bottling company wants to estimate the proportion of employees that are pleased with the cleanliness of the bathrooms. She considers two methods of obtaining a sample of 550 employees from the 3,500 employees at the company. Part A: To make the process easier, the manager considers surveying the first 550 employees who enter a company’s annual conference center. Identify the type of sampling method proposed and discuss why this sampling method might be biased. (5 points)Part B: The second method the HR manager is contemplating involves using a random number generator app to choose a simple random sample of 550 employees from a list of 3,500 employee names. How could she implement this method? (5 points)

(02.05 LC)  A researcher is studying the effects of playing chess on memory improvement. He identifies 50 people who play chess and 50 people who do not. Each of the 100 people is given a questionnaire designed to determine memory level. None of the 100 people who participated in the study knew they were part of a study. Which statement is true? (5 points)

(02.04 LC)  For a certain experiment, the available experimental units are 12 people—six females (f) and six males (m). Use (1f, 2f, 3f, 4f, 5f, 6f) to denote the females and (1m, 2m, 3m, 4m, 5m, 6m) to denote the males. There are to be six treatment groups: A, B, C, D, E, and G. If a randomized block design is used, with the experimental units blocked by gender, which assignment of treatments is not correct? (5 points)

Which of the species in the diagram shown, has a higher affinity for the mobile phase?

(03.02 MC) Andrew believes the honor roll students at his school have an unfair advantage in being assigned to the math class they request. He asked 500 students at his school the following questions: “Are you on the honor roll?” and “Did you get the math class you requested?” The results are shown in the table below: Honor roll Not on honor roll Total Received math class requested 215 125 340 Did not get math class requested 80 80 160 Total 295 205 500 Help Andrew determine if all students at his school have an equal opportunity to get the math class they requested. Show your work and explain your process for determining the fairness of the class assignment process. (10 points)

(02.04 LC)  For a certain experiment, the available experimental units are eight people: four females (f) and four males (m). Use (1f, 2f, 3f, 4f) to denote the females and (1m, 2m, 3m, 4m) to denote the males. There are to be four treatment groups: A, B, C, and D. If a randomized block design is used, with the experimental units blocked by gender, which assignment of treatments is correct? (5 points)