MATH 225N WEEK 1 ASSIGNMENT COMPARING SAMPLING METHODS ANSWERS, Assignments of Mathematics

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MATH 225N WEEK 1 ASSIGNMENT COMPARINGSAMPLING METHODS ANSWERS

- 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? Select the correct answer

below: Simple random

sampling Cluster sampling Stratified Sampling Systematic sampling Convenience sampling

- 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 ofresidents from each age group. Which type of sampling is used?

Select the correct answer

below: Systematic

sampling Stratified sampling Convenience sampling Cluster sampling

- 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. For each day of the week, randomly select 5% of all flights that depart on that day of the week. Divide all flights into the following 4 groups on the basis of scheduled departure time: before 9:00 am, 9:00 am to 1:00 pm, 1:00 pm to 5:00 pm, and after 5:00 pm. Randomly select 5% of the flights in each group. For each crew member the airline employs, randomly select 5 flights that the crew member works.

Divide the airports from which the airline's flights depart into 4 regions: Northeast, Northwest, Southwest, and Southeast. Randomly select 5% of all flights departing from airports in each region.

- To study the mean respiratory rate of all people in hisstate, Frank samples the population by dividing the residents by towns and randomly selecting 12 of thetowns. He then collects data from all the residents in the selected towns. Which type of sampling is used? Select the correct answer below: Convenience sampling Systematic sampling Stratified sampling Cluster sampling - When is stratified sampling appropriate? Select the correct answer below: Stratified sampling is a good choice when the population has multiple distinct