University of Maryland University College Stat 2000 (Whealon) Quiz 1 Directions: Read and sign the academic honesty certification statement below before taking the quiz. Please show your work for maximum credit. 40 points are possible on this quiz. The test and work is due as specified in the \"Course Schedule\". Late submissions are not accepted except in the case of extenuating documented emergencies. Add extra spaces if you need them! This is an open-book, open-notes quiz. A calculator, Excel or other software may be used. If you use assistance such as a calculator app or Excel, say so and explain what functions were used. I certify that the work submitted on and with this document represents my own personal work. I certify that I have not collaborated with, or consulted with, anyone else to produce the work I am submitting. I understand and agree to abide by UMUC Policy on Academic Dishonesty and Plagiarism. ____________________________________________ Student Signature and Date 1. (6 pts) One study about smokeless tobacco used40 university students as subjects. Twenty were given smokeless tobacco to chew and twenty were given a substance that looked and tasted like smokeless tobacco. The students were randomly assigned to one of the groups. The students' blood pressure and heart rates were measured before they started chewing and again 20 minutes after they had been chewing. A significant increase in heart rate occurred in the group that chewed smokeless tobacco. a. Is this an experiment or an observation? b. If it's an experiment, what is the response or dependent variable? If it's an observation, what are they observing? c. Which group serves as the control group? d. Could the students' blood pressure be affected by the knowledge that they are part of a study? e. Do you think this is a good way to study the effect of smokeless tobacco? Why or why not? 2. (6 pts) Determine if the variables listed below are qualitative or quantitative. If the variable is quantitative, determine if it is discrete or continuous. a. b. c. d. times it takes to mow a lawn Classification of children at a daycare(infant, toddler, preschool) Phone number Number of cheeseburger sold in a day on a college campus 3. (2 pts) Following the 2010 national midterm elections, 12% of the governors of the 50 United States were female. Is 12% a parameter or a statistic and why? 4. (6 pts) A survey asked if people would like to spend the rest of their careers with their present employers. The results are shown.: Response Yes No Undecided Number of People 660 260 80 a. Construct a relative frequency distribution. You may add a column to this table. b. Construct a pie chart. c. Construct a bar chart. 5. (6 pts) The number of highway miles per gallon of the 10 worst vehicles is shown below: 12 15 13 14 15 16 17 16 17 18 Find the mean, median, mode, range, variance, and IQR 6. (14 pts) You set up a survey on how people believe the American culture (television, movies, magazines, and popular music) influences illegal drug use. Your survey consists of 2250 adults and adolescents from around the United States. A consumer group petitions you for more information about your survey. Since you designed this study, answer the following questions for them: a. What type of survey did you use and why? (phone, mail, or interview) b. What are the advantages and disadvantages of the survey methods you did not use? c. What data did you collect in your survey? Why did you choose it? d. What type of scale (nominal, ordinal, interval, or ratio) did you use? Why? e. Which of the methods (stratified, systematic, cluster, or convenience) did you use and why