A city posts an online poll about park fees on its website, and any resident may click the link and answer. Which bias does this collection method carry?

A principal surveys only students in the school library during lunch to estimate all students' weekly reading time. Which sampling bias is the main problem?

A random sample of 300 parents is called about school start times, but 180 do not answer or refuse. Which bias is most directly possible?

A newspaper asks readers to mail in a card if they oppose a new stadium plan. Which bias does this method most clearly create?

A district estimates student internet access with a survey that opens only on a home internet connection. Students without home internet can never take it. Which bias is present?

A clinic selects 120 patients for a satisfaction survey, but only 35 return the mailed form. Which named bias is the clearest concern?

A radio host asks listeners to text whether the city should ban scooters, and only listeners who choose to text are counted. Which bias fits best?

A survey about homework is given only in honors classes, but the target population is every student in the school. What is the main bias?

A store prints a receipt link asking customers to rate service, and only customers who visit the link are included. Which bias is most likely?

A random sample of 500 alumni is mailed a donation survey, but many addresses are old and 220 surveys never reach anyone. Which bias is the issue?

A city chooses 400 voters at random for a recycling survey, but 260 selected voters never complete it after reminders. Which bias should be named?

A university draws its sample of 500 students from the registrar's list of students enrolled in on-campus Fall courses. Students studying abroad that semester are not on the list at all. Which bias does this create?

A survey asks, "Should the city stop the dangerous practice of allowing cars near the school?" Which feature of this question is the problem?

A ballot survey asks, "Do you agree that our excellent public library deserves a larger budget?" Which part creates bias?

A town form asks, "Do you oppose the selfish demand for later trash pickup?" What is wrong with the wording?

A survey asks, "Should responsible students always wear school ID badges?" Which feature makes the question biased?

A club survey asks, "Do you reject the unfair rule that limits meeting snacks?" Which feature is the source of bias?

A city survey asks, "Should taxpayers keep funding the failed downtown flower program?" What is the wording problem?

A school form asks, "Do you support the smart choice of adding more science labs?" Which wording feature causes bias?

A survey asks, "Should the mayor end the ridiculous ban on food trucks?" What makes this question biased?

A neighborhood survey asks, "Do you favor protecting children by lowering the speed limit?" Which feature is biased?

A survey asks, "Should we finally fix the embarrassing condition of the gym floor?" Which feature is the problem?

A teacher asks students aloud, "How many nights did you do the assigned reading?" and records answers beside names. Which response bias is most likely?

A coach asks players face to face how many off-season workouts they completed, then writes each answer on the roster. What bias is likely?

At a dental visit, the dentist asks a patient how often they floss, and the hygienist records the answer in the chart. Which bias is most likely?

A principal asks students by name whether they have ever copied homework, while an assistant records answers. Which response bias is likely?

A police officer at a checkpoint asks drivers whether they were wearing seat belts before stopping. Which response bias is most likely?

A cafeteria manager asks students in person to rate the cafeteria food while standing at the checkout. Which response bias is most likely?

A doctor asks patients face to face how many sugary drinks they have each day and enters the answer in the medical record. What bias is likely?

A supervisor asks employees by name how many minutes they arrived late last month and saves answers in a file. Which response bias is likely?

A landline phone survey estimates average adult age. Mobile-only households are missed, and they are younger on average. What happens to the estimate?

An online survey estimates average household income. Homes without internet are missed, and those homes have lower incomes on average. What is the bias direction?

A club emails a survey to estimate average events attended. Members who rarely check email are missed and attend fewer events. How is the estimate affected?

A grocery survey is done only on weekday mornings to estimate average spending per trip. Weekend shoppers are missed and spend more on average. Which direction results?

A school measures bus satisfaction by surveying students in the car-rider line. Bus riders are missed and are less satisfied. What happens to the satisfaction estimate?

A campus survey estimates average commute distance using only dorm residents. Commuters are missed and travel farther on average. Which bias direction is expected?

A restaurant uses a QR code survey to estimate average customer age. Customers without smartphones are missed and are older on average. What is the direction?

A factory estimates defect rate by checking only the first hour of production. Later hours are missed and have more defects. How is the defect-rate estimate biased?

A clinic estimates average wait time using only patients who complete visits. Patients who leave without being seen are missed and waited longer. What happens?

A town surveys recycling by calling numbers listed in a phone directory. Unlisted households are missed and recycle less often. What is the likely effect?