Probability & Statistics - Identifying Sampling Strategies - Review - Samantha Leone | Library

Instructions

For each of the following scenarios, identify the sampling strategy that was used.
Probability Sampling Methods: Simple Random Sample (SRS), Stratified Sample, Cluster Sample, Systematic Sample 
Non-Probability Sampling Methods: Convenience Sample, Voluntary Response Sample

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A newspaper advise columnist asks her readers if they would have married their current spouse if they had it to do over again.

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A researcher planning a survey of heads of households in New York has census lists for each of the 62 counties in the state. The procedure will be to obtain a simple random sample of heads of households from each of the counties rather than grouping the census lists together.

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A bank wishes to survey its customers. The decision is made to randomly pick ten customers who just have checking accounts, ten customers who just have savings accounts, and ten customers who have both checking and savings accounts.

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A human resources department plans to survey 100 of the 3000 employees in the firm. An alphabetical list of the employees is available, a random number between 1 and 30 is picked, and the sample consists of the person that far down the list together with every 30th person after that.

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To survey the opinions of people attending a particular Broadway play, a surveyor plans to select every 25th theater-goer starting at a random individual, as he or she exits the conclusion.

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You wish to survey people who have brought their cars for service during the past month. You decide to pick a random sample of gas stations in the city and then survey all customers from those stations who had work done during the past month.

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A candy manufacturer wants to test consistency of the sugar content of chocolate-covered cherries produced in one factory. The company decides to randomly select 3 boxes of chocolate-covered cherries from each day's production run at the factory and analyze every cherry in each of these boxes as to sugar content.

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In order to estimate the percentage of defects in a recent manufacturing batch, a quality control manager at Intel selects every 8th chip that comes off the assembly line starting with the 3rd, until she obtains a sample of 140 chips.

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In an effort to determine customer satisfaction, United Airlines randomly selects 50 flights during a certain week and surveys all passengers on those flights.

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A member of Congress wishes to determine her constituency’s opinion regarding estate taxes. She divides her constituency into three income classes: low-income households, middle-income households, and upper-income households. She then takes a random sample of households from each income class.

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In an effort to identify whether an advertising campaign has been effective, a marketing firm conducts a nationwide poll by randomly selecting individuals from a list of known users of the product.

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A radio station asks its listeners to call in their opinion regarding the use of American forces in peacekeeping missions.

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A farmer divides his orchard into 50 subsections, randomly selects 4 and samples all of the trees within the 4 subsections in order to approximate the yield of his orchard.

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A university official divides the student population into five classes: freshman, sophomore, junior, senior, and graduate student. The official takes a random sample from each class and asks the members’ opinions regarding student services.

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A survey regarding download time on a certain website is administered on the Internet by a market research firm to anyone who will take it.

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A lobby has a list of the 100 senators of the United States. In order to determine the Senate’s position regarding farm subsidies, they decide to talk with every seventh senator on the list starting with the third.

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How much sleep do high school students get on a typical school night? An interested student designed a survey to find out. To make data collection easier, the student surveyed the first 100 students to arrive at school on a particular morning.

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Some people in the city have been complaining that the children's playground at a municipal park is too small and in need of repair. Managers of the park decided to survey city residents to see if they believe the playground should be rebuilt. They hand out a questionnaire to parents who bring their children to the park.

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An amusement park has opened a new roller coaster. It is so popular that people are waiting for up to 3 hours for a 2-minute ride. Concerned about how patrons (who paid a large amount to enter the park and ride on the rides) feel about this, they survey every 10th person in line for the roller coaster, starting from a randomly selected individual.

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Administrators at Texas A&M University were interested in estimating the percentage of students who are the first in their family to go to college. The A&M student body has about 46,000 members. Using a computer based list of all registered students, randomly select 800 students to answer a survey.

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Administrators at Texas A&M University were interested in estimating the percentage of students who are the first in their family to go to college. The A&M student body has about 46,000 members. Using a computer based list of all registered students, randomly select 200 freshmen, 200 sophomores, 200 juniors and 200 seniors.

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Administrators at Texas A&M University were interested in estimating the percentage of students who are the first in their family to go to college. The A&M student body has about 46,000 members. Select several dormitories at random and contact everyone living in those buildings.

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The Consumers Union organization posted a survey on their website and published it in their magazine asking subscribers whether or not they had ever used alternative medical treatments and, if so, whether they benefited from them.

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Gallup recently conducted a survey on President Biden's approval rating. Results for this Gallup poll are based on telephone interviews conducted Nov. 1-21, 2023, with a random sample of 1,013 adults, aged 18 and older, living in all 50 U.S. states and the District of Columbia.

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The website www.gamefaqs.com asked, as their question of the day to which visitors to the site were invited to respond, "Do you ever use emoticons when you type online?" Of the 87,262 respondents, 27% said that they did not use emoticons. ;-(