A bottling plant makes 4,000 bottles in one shift. From the production-order list, an inspector randomly chooses bottle 14, then tests every 50th bottle after that. Name the sampling method.

At a high school with 1,200 students grouped by grade, the counselor randomly selects 25 freshmen, 25 sophomores, 25 juniors, and 25 seniors. What sampling method did the counselor use?

At a school with 1,560 students stored on one ID list, an assistant uses a random-number generator to choose 100 different student IDs from the entire list. Classify the sampling method.

A district has 48 math classes containing 1,440 students. The director randomly selects 6 whole classes and surveys every student in those classes. Name the sampling method.

A teacher wants opinions from the 1,100 students whose records are grouped by grade. During lunch, she surveys the first 40 students who enter her room. What sampling method is this?

A library has 1,200 cardholders in one computer file. The manager assigns each cardholder a number and uses software to randomly choose 80 numbers. What sampling method did the manager use?

A city has 60 neighborhood blocks containing 3,600 households. A survey team randomly selects 6 blocks and interviews every household on those blocks. Classify the sampling method.

A factory has 900 employees grouped by day, evening, and night shifts. Human resources randomly chooses 30 employees from each shift for a survey. Name the sampling method.

At a mall with about 5,000 shoppers in a day, a researcher stands near the main entrance and interviews the nearest 100 shoppers who pass by. What sampling method is this?

A grocery store has 1,800 receipts filed in time order. The analyst randomly starts with receipt 7, then checks every 30th receipt after that. Classify the sampling method.

A warehouse has 200 boxes arranged on 20 pallets. The supervisor randomly selects 4 pallets and inspects every box on those pallets. What sampling method did the supervisor use?

A gym has 950 members in one spreadsheet. The owner uses a random-number generator to select 50 row numbers from the full member list. Name the sampling method.

A cafeteria expects 900 students in one lunch line. The monitor randomly chooses the 12th student, then surveys every 25th student after that. What sampling method is this?

A county has 3,000 registered voters grouped as unaffiliated, party A, and party B. The clerk randomly samples 120 voters from each registration group. Classify the sampling method.

A coach wants opinions from the 300 school athletes grouped by team. He asks the 25 athletes at his own practice because they are available. Name the sampling method.

A clinic has 800 patients grouped as children, adults, and seniors. The office randomly selects 40 patients from each age group for a satisfaction survey. What sampling method is this?

A clinic has 1,200 appointments listed chronologically. A clerk randomly picks one of the first 20 appointments, then calls every 20th appointment after it. Classify the sampling method.

A nurse wants feedback from 700 weekly patients whose records are grouped by doctor. She surveys the first 35 patients who check in after 9 a.m. Monday. Name the sampling method.

An airport has 120 flights today, each flight forming a group of passengers. The analyst randomly selects 10 flights and surveys every passenger on those flights. What sampling method is this?

A town has 4,800 households in one address database. Software randomly chooses 240 addresses from the full database for a recycling survey. Name the sampling method.

An app company has 2,000 users grouped by subscription plan. A developer asks 30 coworkers sitting nearby what they think of the app update. Classify the sampling method.

A college has 90 dorm floors with 2,700 residents total. Housing officials randomly choose 12 floors and survey every resident on those floors. What sampling method did they use?

A college has 2,500 students grouped as residents and commuters. To match enrollment shares, the office randomly chooses 80 residents and 70 commuters. Name the sampling method.

A farm cooperative has 320 member farms in one numbered directory. An auditor uses random digits to choose 32 farm numbers for a soil survey. What sampling method is this?

A website has 10,000 visits recorded in order. The analyst randomly starts with visit 18, then reviews every 100th visit after that. Classify the sampling method.

A taxi company has 600 rides grouped as weekday or weekend rides. The manager randomly selects 50 weekday rides and 50 weekend rides for review. Name the sampling method.

A city has 90,000 residents listed by precinct. An intern stands outside one library branch and surveys 80 passersby who agree to stop. What sampling method is this?

A museum has 2,500 members on an alphabetical list. Staff randomly choose the 9th name, then contact every 40th name after it. Name the sampling method.

A researcher must take a cluster sample of a school district's 2,400 students, who are enrolled in 40 classrooms of about 60 students each. Which procedure does that?

A quality analyst must take a simple random sample of the 4,000 bottles produced during a shift. Which procedure does that?

A company has 35 branches averaging 50 employees each. Plan 1 selects 5 branches at random and surveys every employee there. Plan 2 selects 5 employees at random from each branch. Which plan is the cluster sample?

A researcher must take a stratified sample of a hospital's 800 patients, who are grouped as children, adults, and seniors. Which procedure does that?

A toll authority must take a systematic sample of the 3,600 cars that pass a booth in one day, listed in arrival order. Which procedure does that?

A university has alumni in 50 regional chapters of 200 each. Plan 1 selects 20 alumni at random from each chapter. Plan 2 selects 5 chapters at random and surveys every alumnus there. Which plan is the stratified sample?

A science club must take a convenience sample of the 650 students at their school. Which procedure does that?

A property manager must take a cluster sample of 2,400 residents living in 60 apartment buildings of 40 residents each. Which procedure does that?

A factory manager must take a stratified sample of 900 employees who work day, evening, and night shifts. Which procedure does that?

A librarian must take a systematic sample of the 1,400 checkouts recorded last month, listed in chronological order. Which procedure does that?

A festival uses 100 shuttle buses carrying 4,000 riders total, 40 per bus. Plan 1 selects 12 buses at random and surveys every rider on those buses. Plan 2 selects 4 riders at random from each of the 100 buses. Which plan is the cluster sample?

A school has 720 athletes grouped into 12 sports teams of 60 athletes each. Plan 1 selects 5 athletes at random from each of the 12 teams. Plan 2 selects 3 teams at random and surveys every athlete on those teams. Which plan is the stratified sample?