\( \ldots \) it/PlayerTest.aspxitestld \( =2700798798 \) icenterwin \( = \) yes Alonna Harvey-Williams \& 02/05/25 12:26 PM 0 Question 3 of 82 This quiz: 82 point(s) possible This question: 1 point(s) possible Resume later Submit quiz To determine customer opinion of their pricing. Arntrak randomly selects 120 trains during a certain week and surveys all passengers on the trains. What type of sampling is used? A. Stratified B. Cluster C. Simple random D. Systematic E. Convenience Time Remaining: 03:45.50 Next
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For each scenario, determine the statistical sampling technique used (random, systematic, convenience, stratified, or cluster). Question 1 A company selects every 25th person on the payroll to participate in drug testing. Question 1 options: random systematic convenience stratified cluster Question 2 Nursing supervisors are selected using randomly generated employee ID numbers in order to determine annual salaries. Question 2 options: random systematic convenience stratified cluster Question 3 A local politician talks to 20 people in his neighborhood about what they think about the new school board proposal to raise taxes. Question 3 options: random systematic convenience stratified cluster Question 4 At a police sobriety checkpoint, every 5th driver is stopped and interviewed. Question 4 options: random systematic convenience stratified cluster Question 5 A marketing expert for MTV is planning a survey in which 500 people will be randomly selected from each age group of 10-19, 20-29, 30-39, and so on. Question 5 options: random systematic convenience stratified cluster Question 6 A Lake Tahoe Community College instructor is interested in the mean number of days Lake Tahoe Community College math students are absent from class during a quarter. The instructor takes her sample by gathering data on five randomly selected students from each Lake Tahoe Community College math class. Question 6 options: random systematic convenience stratified cluster Question 7 A pollster surveys 75 people in each of a senator's 12 voting precincts. Question 7 options: random systematic convenience stratified cluster Question 8 A woman in the airport is handing out questionnaires to travelers asking them to evaluate the airport's service. She does not ask travelers who are hurrying through the airport with their hands full of luggage, but instead asks all travelers sitting near gates and not taking naps while they wait. Question 8 options: random systematic convenience stratified cluster Question 9 A biostatistician spends four hours on a Monday evening at Lenox Square collecting names of people to participate in an upcoming pharmaceutical research study. Question 9 options: random systematic convenience stratified cluster Question 10 In order to complete a psychology project, a student passes out surveys to the first 25 people she finds in the student center. Question 10 options: random systematic convenience stratified cluster
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CHECK THE BASICS 3.3 What's the parameter? An online store contacts 1500 customers from its list of customers who have purchased in the last year and asks the customers if they are very satisfied with the store's website. One thousand (1000) customers respond, and 696 of the 1000 say that they are very satisfied with the store's website. The parameter is (a) the 69.6% of respondents who replied they are very satisfied with the store's website. (b) the percentage of the 1500 customers contacted who would have replied they are very satisfied with the store's website. (c) the percentage of all customers who purchased in the last year who would have replied they are very satisfied with the store's website. (d) None of the above is the parameter. 3.4 What's the statistic? A state representative wants to know how voters in his district feel about enacting a statewide smoking ban in all enclosed public places, including bars and restaurants. His staff mails a questionnaire to a simple random sample of 800 voters in his district. Of the 800 questionnaires mailed, 152 were returned. Of the 152 returned questionnaires, 101 supported the enactment of a statewide smoking ban in all enclosed public places. The statistic is (a) 152/800 = 19.0% (b) 101/800 = 12.6% (c) 101/152 = 66.4% (d) unable to be determined based on the information provided. 3.5 Decreasing sampling variability. You plan to take a sample of size 500 to estimate the proportion of students at your school who support having no classes and special presentations on Veteran's Day. To be twice as accurate with your results, you should plan to sample how many students? (Hint: Use the quick and approximate method for the margin of error.) (a) 125 students (b) 250 students (c) 1000 students (d) 2000 students 3.6 What can we be confident about? A May 2015 University of Michigan C.S. Mott Children's Hospital National Poll on Children's Health reported that 90% of adults are concerned that powdered alcohol will be misused by people under age 21. The margin of error was reported to be 2 percentage points, and the level of confidence was reported to be 95%. This means that (a) we can be 95% confident that between 88% and 92% of adults are concerned that powdered alcohol will be misused by people under age 21. (b) we can be 95% confident that between 88% and 92% of adults who were surveyed are concerned that powdered alcohol will be misused by people under age 21. (c) we know that 90% of adults are concerned that powdered alcohol
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