This is the final exam for Confirmation Bias. It pulls together the whole course: the lawyer-versus-scientist model and the precise definition, why a sharper mind often defends a belief better rather than checks it, the three places the bias lives (biased search, biased interpretation, biased memory), Wason’s 2-4-6 task and the logic of falsification, motivated reasoning and myside bias, how echo chambers and feeds amplify all of it, why the bias was useful enough to evolve, and the deliberate toolkit that fights it. Take your time and reason each one through — several look easy until you spot the trap the course warned about: “intelligence protects me,” “more information settles disagreement,” “a pile of confirmations is proof,” or “I’m the exception.”
How this exam works
Read carefully — this exam is final. Each question appears one at a time. Once you submit an answer it is locked for good: there’s no going back, no retry, and no restart. Your score is hidden until the end, where you’ll see a pass/fail verdict. The pass mark is 70%. A few questions ask you to select all correct answers.
In the course’s central metaphor, your untrained mind reasons more like a __ than a __. Fill the blanks.
Select an answer to continue.
Course Recap
Big picture
Confirmation bias, in one picture
- Confirmation Bias
- What it is
- The mind reasons like a lawyer, not a scientist — it seeks and weighs evidence for the belief it already holds and skates past what would refute it; intelligence is no shield, it just lawyers better
- The three flavors
- Biased SEARCH (what you look for) → biased INTERPRETATION (how you read it) → biased MEMORY (what you recall) — one belief bent through three stages
- The Wason task & falsification
- 2-4-6: the rule was "any increasing triple"; confirming tests can’t rule a hypothesis out, only a disconfirming test can — Popper’s falsification made physical
- Interpretation & memory
- Motivated reasoning ("Can I?" vs "Must I?"), myside bias, biased assimilation → attitude polarization; echo chambers and feeds optimized for engagement, not truth
- Why it evolved
- Cognitive economy, argumentative theory (reasoning built to persuade, not to be private-truth accurate), and social cohesion — adaptive once, dangerous now
- The antidote
- Consider the opposite, steelman (don’t strawman), seek the strongest disconfirming case (beware token disconfirmation), pre-register what would change your mind, build in dissent (red teams), and beat the bias blind spot by turning it on yourself
- What it is
Key takeaways
Key takeaways
Confirmation bias is the mind’s habit of reasoning like a lawyer, not a scientist: it searches for evidence that fits, interprets ambiguous data to fit, and remembers the hits while forgetting the misses — all bending toward the belief you already hold. Intelligence is no defense; via motivated reasoning a sharper mind just builds a more elaborate case for the answer it wanted (“Can I believe it?” for welcome claims, “Must I believe it?” for unwelcome ones). Wason’s 2-4-6 task shows why: a pile of confirmations proves nothing, because only a disconfirming test can rule a hypothesis out — that’s falsification. At scale it fuels biased assimilation and attitude polarization (the same evidence drives two camps apart), myside bias, and echo chambers built by feeds optimized for engagement rather than truth. It’s near-universal because it was once adaptive — cheap, persuasive, and socially cohesive — but dangerous now. The antidote isn’t willpower, it’s habit: consider the opposite, steelman the other side, seek the strongest disconfirming case, pre-register what would change your mind, build dissent into your environment, and — because of the bias blind spot — turn every bit of it hardest on yourself. The one reflex worth keeping: “What would prove me wrong, and have I actually looked?”