Page 1 of 4 Quiz 1 Stat 200 (Clary) Instructions: Record your answers and work in the space below each problem. Be sure to record the final answer next to \"Answer\" and show all your calculation steps or assumptions under \"Work.\" You can type in your calculations, use the equation tool, or insert images of your handwritten calculations. Remember to add your last and first name to the end of the file name and upload your answers here (e.g., Quiz1.LASTNAME_FIRSTNAME.docx) before submitting. Proble m Number #1 (4 pts) Problem and Solution Identify: a. the population, b. the sample, c. the parameter, d. the statistic, e. the variable, and f. the data. Give examples where appropriate. Pollsters at Gallup interested in the proportion of people who will vote for Donald Trump in the 2016 Presidential Election. Answer: Work: #2 (4 pts) Name the sampling method used in each of the following situations: a. The Democratic National Committee wants to know the reaction of Independent voters to a debate between Hillary Clinton and Donald Trump. The day after the debate, the DNC polling staff calls 1,000 randomly selected phone numbers. If a registered Independent voter answers the phone or is available to come to the phone, the voter is asked whom he or she intends to vote for and whether the debate changed his or her opinion of the candidates. b. American Express is giving away free tickets to Beyonc's Formation World tour and a meetand-greet with Beyonc and Jay Z. Beyonc wants to make sure that there are winners from every major city she is touring in, so her manager randomly selects two winners from the fan club of each city where her tour stops. c. Instagram wants to determine what proportion of their users are college students. An analyst creates a code that will look for college affiliation in every third Instagram account. d. Your stats professor wants to know if her online students are putting off their homework to the Page 2 of 4 last minute, so at the beginning of the week, she randomly selects students with last names that start with C and S, and then asks them to present the solution to the first homework problem in the discussion forum. e. The head of student services at the UMUC College Park campus is handing out questionnaires to UMUC students asking them to evaluate the tutoring services offered on campus. She does not ask students who are hurrying to get to classes, but instead asks all students who are sitting around waiting for their next class. Answer: Work: #3 (4 pts) Seventy teenagers were asked the number of times per week they used social media to say mean things about other teenagers. The (incomplete) results are shown below Bullying Frequency of Teenagers Over Social Media #Bullying per Frequency Relative Week Frequency 0 43 1 2 4 3 3 4 6 a. Fill in the blanks in the table above Cumulative Relative Freq. b. What percent of teenagers bullied others over social media once a week? c. What percent bullied up to 3 times per week? Answer: Work: Page 3 of 4 #4 (4 pts) The following data show the ages of students taking a section of a statistics class at UMUC in Fall 2016. The data are ordered from smallest to largest: 19; 20; 20; 21; 23; 23; 23; 24; 25; 26; 26; 26; 27; 27; 28; 28; 29; 29; 30; 32; 35; 35; 37; 38; 39; 43; 44; 44; 46; 51; 55; 62 Find the Mean, Median, and Mode for this data set. Answer: Work: #5 (4 pts) The World Health Organization collected data in 2015 on the number of children under five years old that are considered to be underweight. % of Underweight Children 16-21.45 21.45-26.9 26.9-32.35 32.35-37.8 37.8-43.25 43.25-48.7 Number of Countries 23 4 9 7 6 1 What is the best estimate for the mean percentage of underweight children? What is the standard deviation? Which interval(s) could be considered unusual? Explain. Page 4 of 4 Answer: Work