A district enrolls 4,820 high school students. A researcher surveys 300 randomly chosen students about hours of sleep and reports a mean of 6.8 hours. What group is the population?

A clinic has 6,300 adult patients. Nurses measure systolic blood pressure in mm Hg for 210 selected patients and report a mean of 128 mm Hg. What group is the population?

A bottling plant makes 12,000 bottles during one shift. Inspectors measure fill volume in milliliters for 80 bottles and report a mean of 499 mL. What group is the population?

A city park department manages 14,500 street trees. Arborists measure trunk diameter in centimeters for 220 selected trees and report a mean of 31 cm. What group is the population?

A library system owns 18,400 print books. Staff record mass in grams for 250 randomly chosen books and report a mean of 640 g. What group is the population?

A farm has 9,200 apple trees. The grower measures yield in kilograms for 160 selected trees and reports a mean yield of 38 kg. What group is the population?

A college has 7,800 commuter students. A planner asks 240 selected commuters their travel time in minutes and reports a mean of 34 minutes. What group is the population?

A restaurant serves 1,150 lunch orders on Friday. Managers time 90 selected orders from payment to pickup and report a mean of 8.4 minutes. What group is the population?

A city has 3,600 household taps. Technicians test nitrate level in mg/L for 72 randomly chosen taps and report a mean of 1.9 mg/L. What group is the sample?

A bus district operates 145 buses. Mechanics measure tire tread depth in millimeters on 20 selected buses and report a mean of 7.6 mm. What group is the sample?

A soccer league lists 520 players. Trainers time a 40-meter sprint for 48 selected players and report a mean of 6.1 seconds. What group is the sample?

An aquarium has 880 fish of one species. Biologists weigh 35 selected fish in grams and report a mean of 52 g. What group is the sample?

A bakery produces 4,500 rolls in a morning batch. Staff weigh 60 selected rolls in grams and report a mean of 82 g. What group is the sample?

A museum expects 22,000 visitors in April. Surveyors ask 250 selected visitors their waiting time in minutes and report a mean of 14 minutes. What group is the sample?

A phone plant makes 18,000 phones in a week. Engineers test battery life in hours for 120 selected phones and report a mean of 16.5 hours. What group is the sample?

A university course enrolls 1,100 students. Instructors grade a random set of 90 final projects and report a mean score of 84%. What group is the sample?

A county employs 680 nurses. Personnel records for all 680 show a mean experience of 8.6 years, and 75 selected nurses report a mean commute of 31 minutes. What is 8.6 years?

A theater sold 2,400 tickets. Scanner logs for all ticket holders show a median entrance wait of 12 minutes, while 80 selected patrons rate service. What is 12 minutes?

A company ships 3,200 bulbs in a batch. Inspectors test lifetime in hours for 100 selected bulbs and report a mean of 940 hours. What is 940 hours?

A school has 1,860 students. A random sample of 186 students reports whether they ride the bus, and 42% answer yes. What is 42%?

A warehouse has 15,000 packages. An automated scale weighs every package in kilograms and finds a standard deviation of 0.18 kg. What is 0.18 kg?

A clinic records 5,400 appointment visits in May. Auditors review 270 selected visits and find that 18% started late. What is 18%?

A district has 910 teachers. Payroll records for all teachers show that 63% hold a master's degree, while 100 teachers answer a workload survey. What is 63%?

A factory makes 8,800 tablets. A quality team measures thickness in millimeters for 110 selected tablets and reports a mean of 7.4 mm. What is 7.4 mm?

A library records 31,200 book checkouts. The system logs loan length in days for every checkout and finds a mean of 18 days. What is 18 days?

A park agency has 2,750 campsite reservations. Staff ask 140 randomly chosen reservations for group size and report a mean of 3.2 people. What is 3.2 people?

A city has 9,000 streetlights. Technicians measure monthly energy use in kWh for 150 selected lights and report a sample mean of 42 kWh. What symbol names the true mean for all 9,000 streetlights?

A botanist studies 3,500 greenhouse seedlings. She measures height in centimeters for 70 chosen seedlings and reports their mean height as 18.6 cm. What symbol names that mean of the 70 measured seedlings?

A school has 2,200 students. Counselors ask 220 selected students whether they biked to school and report 14% yes. What symbol names the true proportion of all 2,200 students who bike?

A county has 4,800 restaurant inspections. Analysts review 120 selected reports and find that 9% include a critical violation. What symbol names the 9% from the selected reports?

A bottling run has 10,000 bottles. An inspector measures fill volume in milliliters for 50 selected bottles and reports a standard deviation of 1.8 mL. What symbol names that standard deviation for the 50 bottles?

A fitness center has 1,600 members. The manager records age in years for every member and finds a standard deviation of 11.2 years; she also samples 80 visits. What symbol names the all-member standard deviation?

A lake agency tracks 720 tagged fish. Biologists weigh 36 selected fish and find a mean of 410 g. They use it to estimate the mean weight of all 720 fish. Which statement uses the symbols correctly?

A high school has 1,240 students. The nurse records height in centimeters for every student during check-in and reports a mean of 168 cm. Is this collection a census or a sample?

A recycling center handles 6,500 cans in a day. Workers weigh 130 randomly chosen cans in grams and report a mean of 15 g. Is this collection a census or a sample?

A lab has 420 labeled chemical bottles. The safety officer checks the volume in milliliters on every bottle and reports that 12% are below 100 mL. Is this collection a census or a sample?

A transit agency records 18,000 bus trips in June. Analysts select 300 trips and record delay time in minutes, finding a mean delay of 4.8 minutes. Is this collection a census or a sample?

A soccer club has 26 teams with 468 players. Coaches record each player's 20-meter sprint time in seconds and report a median of 3.7 seconds. Is this collection a census or a sample?

A supermarket receives 9,600 yogurt cups. Staff measure temperature in degrees Celsius for 96 selected cups and report a mean of 3.4 °C. Is this collection a census or a sample?

A marathon has 3,850 finishers. Timing chips record finish time in minutes for every finisher, and the director reports a mean of 248 minutes. Is this collection a census or a sample?