Stat: Simulations and Intro to Sampling

Willy runs a small company with 10 employees. He decides to pick a simple random sample of three employees to go on a business trip. He numbers them 0-9 and uses the random digit table below to select the sample. Which employees are in the sample? 
67197   28310   90341

• 67, 19, 72, 83, 10
• 67, 19, 72
• 6, 7, 1, 9
• 6, 7, 1

A TV show host asks his viewers to visit his website and respond to an online poll. What type of sample is this?

• simple random sample
• cluster sample
• stratified sample
• none of the above

A manager associated each employee's name with a number on one ball in a container, then drew balls without looking to select a sample of 5 employees. What type of sample is this?

• simple random sample
• cluster sample
• stratified sample
• none of the above

A quality control worker at a factory selects the first 10 items she sees as her sample for the day. What type of sample is this?

• simple random sample
• cluster sample
• stratified sample
• none of the above

A truck manufacturer selects 3 trucks at random from each of 6 different models for testing. What type of sample is this?

• simple random sample
• cluster sample
• stratified sample
• none of the above

David hosts a podcast and he is curious how much his listeners like his show. He decides to start with an online poll. He asks his listeners to visit his website and participate in the poll.The poll shows that 89 percent of the 200 respondents "love" his show. What is the most concerning source of bias in this scenario?

• Response Bias
• Undercoverage
• Voluntary Response Bias
• Nonresponse Bias

A senator wanted to know about how people in her state felt about internet privacy issues. She conducted a poll by calling 100 people whose names were randomly sampled from the phone book (note that mobile phones and unlisted numbers aren't in phone books). The senator's office called those numbers until they got a response from all 100 people chosen.The poll showed that 42 percent of respondents were "very concerned" about internet privacy. What is the most concerning source of bias in this scenario?

• Voluntary response bias
• Nonresponse bias
• Undercoverage
• Convenience Sampling

A high school wanted to know what percent of its students smoke cigarettes. During the week when students visited the counselors to schedule classes, they asked every student in person if they smoked cigarettes or not.The data showed that 5 percent of students smoked cigarettes. What is the most concerning source of bias in this scenario? 

• Response bias
• Undercoverage
• Voluntary Response Bias
• Bad Sampling Frame

A principal takes an alphabetized list of student names and picks a random starting point. Every 20th student is selected to take a survey. What type of sample is this?

• Simple random sample
• stratified sample
• cluster sample
• systematic sample

An airline company wants to survey its customers one day, so they randomly select 5 flights that day and survey every passenger on those flights. What type of sample is this?

• simple random sample
• systematic sample
• cluster sample
• none of the above