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📊AP Statistics
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📊AP Statistics

FRQ 1 – Multi-Focus on Practices 1 and 2
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Unit 1: Exploring One-Variable Data and Collecting Data
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AP Stats FRQ Types & Units

Each FRQ type tests specific skills taught in particular units. Here's why certain units appear for each question type:

FRQFocusUnitsWhy
FRQ 1Multi-Focus on Practices 1 and 21Tests formulating an investigative question and collecting data (sampling, experimental design)
FRQ 2Multi-Focus on Practices 3 and 41, 2, 5Tests analyzing data and interpreting results — graphs, summary statistics, probability, regression output
FRQ 3Inference3, 4One complete inference procedure — a hypothesis test or confidence interval for proportions or means
FRQ 4Multi-Focus on Practices 2, 3, and 4AllCombines content areas across the course, assessing collecting, analyzing, and interpreting together

This mapping reflects College Board's exam structure - each FRQ type tests specific skills that are taught in particular units.

Practice FRQ 1 of 111/11

1. A regional airport authority is investigating passenger wait times at security checkpoints to improve operational efficiency.

A.

The airport authority initially proposes the following investigative question: "Do passengers wait a long time at security?"

Identify one flaw in this investigative question and state a refined investigative question that addresses the flaw, specifies the population, and focuses on a quantitative variable.

B.

To collect data, an airport official suggests recording the wait times of the first 100 passengers who enter the security line on a Tuesday at 5:00 AM.

Identify the sampling method proposed. Explain how this method could introduce bias into the estimate of the mean security wait time for all passengers at this airport, and state the likely direction of the bias.

C.

The authority decides instead to use a stratified random sample of 300 passengers, using the time of day (morning, afternoon, evening) as the strata.

Describe a procedure the airport authority could use to select this stratified random sample.

D.

In a separate study, the airport authority wants to determine if a new automated bin-return system reduces passenger wait times compared to the standard system. They recruit 150 volunteer passengers and randomly assign 75 to use the new automated system and 75 to use the standard system.

Explain why this study design allows the authority to establish a cause-and-effect relationship, and identify the population to which the results of this study can be appropriately generalized.

Timed

00:00

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Free Response Question Practice

This practice environment simulates the AP AP Statistics Free Response Questions section. Here are some guidelines:

  • Read each question carefully before responding. Pay attention to command verbs like "identify," "explain," "analyze," or "evaluate."
  • Use the timer to practice time management. You can pause, restart, or hide the timer as needed.
  • Mark for Review if you want to come back to a question later.
  • Your responses are saved automatically as you type. You can also use the drawing tool for questions that require diagrams or graphs.
  • Use the toolbar for formatting options like bold, italic, subscript, and superscript.
  • Navigate between questions using the Previous and Next buttons at the bottom of the screen.

Tip: Answer all parts of each question. Partial credit is often available, so even if you are unsure, provide what you know.