Exam (elaborations) MATH 225N MATH

1. A television station plans to send a crew to a polling center on an election day. Because they do not have time to interview each individual voter, they decide to count voters leaving the polling location and ask every 20th voter for an interview. What type of sampling is this? 2. In order to study the shoe sizes of people in his town, Billy samples the population by dividing the residents by age and randomly selecting a proportionate number of residents from each age group. Which type of sampling is used? 3. The management of a large airline wants to estimate the average time after takeoff taken before the crew begins serving snacks and beverages on their flights. Assuming that management has easy access to all of the information that would be required to select flights by each proposed method, which of the following would be reasonable methods of stratified sampling? Select all that apply. 4. To study the mean respiratory rate of all people in his state, Frank samples the population by dividing the residents by towns and randomly selecting 12 of the towns. He then collects data from all the residents in the selected towns. Which type of sampling is used? 5. When is stratified sampling appropriate? 6. In reference to different sampling methods, cluster sampling includes the steps: use simple random sampling to select a set of groups; every individual in the chosen groups is included in the sample. 7. When is cluster sampling appropriate? 8. To study the mean head size of all people in her state, Jacqueline collects data from 20 people in her town. Which type of sampling is used? 9. An executive for a large national restaurant chain with multiple locations in each of 513 counties wants to personally sample the cleanliness of the chain's restaurants This sttuhdyrosouurcge hwaos udotwntlhoaedecd boyu10n00t0r0y81b59y481v1i2sfriotminCgourrseeHaonn0t4s-2.4-T20h21e08e:2x9:e15cGuMtiTv-0e5:w00 ants a good-quality sample but wants to minimize travel time and expenses. Which of the following sampling methods would be most appropriate? ....................................CONTINUED..................................