A cafeteria surveys 240 randomly chosen students and records whether each bought school lunch today. The goal is to estimate the share of all students who buy school lunch. What parameter is being estimated?

A town samples 80 apartment households and records each household's monthly electricity use in kilowatt-hours. The town wants to estimate the mean monthly use for all apartment households. What parameter is being estimated?

A clinic asks 150 randomly chosen patients whether they got a flu shot this year. The clinic wants to estimate the fraction of all its patients who got a flu shot. What parameter is being estimated?

A coach records the 5K race times, in minutes, for 30 randomly selected runners on a team. The coach wants to estimate the average 5K time for the whole team. What parameter is being estimated?

An online shop samples 500 orders and records whether each order arrived late. Managers want to estimate the percentage of all orders that arrive late. What parameter is being estimated?

A farm randomly selects 60 tomatoes from a crop and weighs each tomato in grams. The farm wants to estimate the average weight of all tomatoes in the crop. What parameter is being estimated?

A school district samples 90 classrooms and records the number of students in each room. It wants to estimate the mean class size across all district classrooms. What parameter is being estimated?

A library asks 300 randomly chosen visitors whether they used the e-book service this month. The library wants to estimate the proportion of all visitors who use the service. What parameter is being estimated?

A bottling plant randomly inspects 400 bottles and records whether each bottle is underfilled. It wants a confidence interval for the fraction of all bottles that are underfilled. What procedure is appropriate?

A technician samples 36 tablet batteries, records battery life in hours, and wants a confidence interval for the mean battery life of all such batteries. The population standard deviation is unknown. What procedure is appropriate?

A city surveys 620 randomly chosen voters and records whether each supports a new bike lane. The city wants a confidence interval for the support rate among all voters. What procedure is appropriate?

A forester samples 42 trees, measures each height in meters, and wants a confidence interval for the mean height of all trees in that grove. The population standard deviation is unknown. What procedure is appropriate?

An accountant samples 75 invoices, records each total amount in dollars, and wants a confidence interval for the mean invoice amount for all invoices. The population standard deviation is unknown. What procedure is appropriate?

A park survey asks 180 randomly chosen visitors whether they recycled a bottle that day. The park wants a confidence interval for the proportion of all visitors who recycled. What procedure is appropriate?

A polling group reports $\hat{p}=0.58$ after asking 900 adults whether they stream music. What statistic is reported, and what parameter does it estimate?

A lab reports $\bar{x}=92.4$ liters from 25 water filters tested until replacement. What statistic is reported, and what parameter does it estimate?

A commuter survey reports $\hat{p}=0.31$ after asking 400 workers whether they usually commute by bus. What statistic is reported, and what parameter does it estimate?

A nursery measures 40 seedlings and reports $\bar{x}=18.6$ centimeters for seedling height. What statistic is reported, and what parameter does it estimate?

A quality team reports $\hat{p}=0.08$ after inspecting 250 packages for a damaged label. What statistic is reported, and what parameter does it estimate?

An environmental club samples 28 cafeteria trays and reports $\bar{x}=0.34$ kilograms of food waste per tray. What statistic is reported, and what parameter does it estimate?