Quiz — Chapter 18: Conference Presentations and Posters

Target: 70%+ before moving on. Answers and explanations are hidden under each question — try first, then check.

Section 1 — Multiple Choice

1. The core reason a text-dense slide read aloud causes "death by PowerPoint" is that:

  • A. The font is usually too small to read from the back
  • B. People cannot read and listen at the same time, so the text competes with the speaker's voice
  • C. Bulleted lists are inherently boring
  • D. The projector colors wash out the text
Answer**B.** Reading and listening both consume the verbal channel in working memory; force them to compete and both degrade. The audience reflexively reads the text (and races ahead of the speaker), so the speaker's voice — which carries the argument — is lost. Small fonts (A) and bad color (D) are real problems but not *the* mechanism; "boring" (C) is a symptom, not the cause. (§18.1)

2. Which of these is an assertion–evidence slide headline?

  • A. "Results"
  • B. "Cycle Life"
  • C. "Battery Performance Data"
  • D. "Our interphase holds 94% of capacity after 800 cycles, nearly double the prior best"
Answer**D.** It's a full sentence that makes a *claim* — the point you want the audience to take away. A, B, and C are noun-phrase *topics* that state no point. The one-look test: a sentence headline is assertion–evidence; a topic headline isn't. (§18.2)

3. As a rough sanity check, about how many slides should a 15-minute conference talk have?

  • A. Around 15 (≈ one per minute), usually fewer
  • B. Around 30 (two per minute)
  • C. As many as needed; slide count doesn't matter
  • D. Exactly 10, always
Answer**A.** One slide per minute is a *rough heuristic and sanity check*, not a law — so ~15 for 15 minutes, often fewer. Thirty (B) is a talk you can't give at a human pace. Slide count does matter as a check (C is wrong). A fixed "exactly 10" (D) overstates a guideline into a law. (§18.3)

4. You should aim to finish a timed conference talk at about:

  • A. 100% of the allotted time (fill every second)
  • B. 110% (a little over is fine; chairs are flexible)
  • C. 90% of the allotted time
  • D. 50% (always leave half the time for questions)
Answer**C.** Aim for ~90% (a 15-minute talk landing in 13–14 minutes), because live talks expand and you need margin for slides that run long or moments you lose your place. Filling 100% (A) guarantees running over; over-time (B) steals from the next speaker. Q&A time is usually allotted *separately* by the chair, so 50% (D) is wrong. (§18.3)

5. The first design decision for a research poster should be:

  • A. Choosing a color scheme
  • B. Deciding the single takeaway you want a viewer to remember
  • C. Picking the font
  • D. Deciding how many columns to use
Answer**B.** A poster has *one* takeaway, the way a slide has one assertion; everything else delivers or supports it. Color, font, and columns (A, C, D) are downstream layout choices that should serve the takeaway, not precede it. (§18.4)

6. A good research-poster title should be:

  • A. The topic of the study, stated neutrally and comprehensively
  • B. The finding, phrased so the right people stop ("A Sulfide Interphase Doubles Cycle Life")
  • C. As long and specific as possible to be precise
  • D. The same as the paper's title, always
Answer**B.** The title is the only thing most passersby read, so make it the *finding*, large and readable across the room. A neutral topic title (A) or a long precise one (C) stops no one; the paper's title (D) is often a topic phrase optimized for a different medium. (§18.4)

7. What is the key difference between preparing a 5-minute lightning talk and a 15-minute talk?

  • A. The lightning talk just compresses the long one and speaks faster
  • B. The lightning talk selects one idea; it doesn't compress all the points
  • C. Lightning talks don't need a hook
  • D. Lightning talks should have more slides because there's less time per slide
Answer**B.** The shift is *select, don't compress*. A 5-minute talk carries one idea; compressing keeps all the points and shrinks each, producing a rushed version of everything that lands as nothing (A is the error). A lightning talk needs a hook *fast* — within ~15 seconds (C wrong) — and *fewer* slides, ~5 (D wrong). (§18.5)

8. When asked a question you genuinely cannot answer, the strongest move is to:

  • A. Make your best guess sound confident so you don't look unprepared
  • B. Say "I don't know," then bridge — name the limit precisely and offer a reasoned prediction
  • C. Redirect to a different question you can answer
  • D. Say the question is out of scope and move on
Answer**B.** Honest "I don't know" plus a bridge (the precise limit + future work + a reasoned prediction) is *more* credible than bluffing, because an expert audience detects bluffs and a detected bluff poisons trust in everything else you said. Confident guessing (A) is the trap; dodging (C, D) reads as evasive. (§18.6)

9. The most important reason to have a static backup for a live demo or video is:

  • A. To save time setting up
  • B. Because live demos, videos, and connections fail eventually, and the talk must survive it
  • C. Because backups look more professional
  • D. Because conference rules require it
Answer**B.** Anything that can fail live *will* fail eventually — the projector won't sync, the wifi drops, the demo crashes — so always have a non-live version (screenshots, a recorded clip, the key numbers on a slide). The other reasons are minor or untrue in general. (§18.7; treated more fully in Chapter 31.)

10. On an assertion–evidence slide, the body should be:

  • A. A bulleted summary of the key points
  • B. A single visual (graph, photo, diagram, or one big number) with direct labels
  • C. A paragraph explaining the finding in full
  • D. The full data table from the paper
Answer**B.** The body is a single piece of *visual* evidence for the headline's claim, with labels placed directly on the visual (no ping-ponging to a legend). Bullets (A) and paragraphs (C) are text that competes with your voice; a full data table (D) is a document element, unreadable on a slide. (§18.2)

11. "Front-loading the result" in a conference talk means:

  • A. Putting all your results slides at the very start and the methods at the end
  • B. Promising or stating the key result in the first ~90 seconds, not building up to it at the end
  • C. Showing every result before any interpretation
  • D. Loading the slides onto the conference laptop early
Answer**B.** Researchers tend to recreate their discovery order (background → methods → finding last), which puts the thing the audience came for where attention is lowest. Front-loading promises the result early and restates it at the close — BLUF ([Chapter 4](../../part-01-writing-is-thinking/chapter-04-structure/index.md)) on a clock. It doesn't mean reordering all sections mechanically (A, C). (§18.3)

12. The "reading path" of a poster refers to:

  • A. The route attendees walk through the poster hall
  • B. An obvious order — numbers, arrows, or strong column flow — telling the eye where to start and go next
  • C. The list of references at the bottom
  • D. The path of your laser pointer during the pitch
Answer**B.** A poster must make it *obvious* where to begin and where to go next, because a reader who can't find the entry point leaves. Numbered sections, arrows, or strong left-to-right column flow create the path. (§18.4)

Section 2 — True/False with Justification

State true or false and justify in one sentence — the justification is the point.

T1. "A conference talk should be a complete, compressed version of your paper so the audience gets everything."

Answer**False.** A talk is a *trailer* for the paper, not a compressed paper — it carries one peak result with just enough method to trust it and sends people to the paper for the full literature review, methods, and caveats; trying to include "everything" guarantees racing and losing the room. (§18.3)

T2. "Putting your full argument in text on each slide is good insurance, because distracted audience members can catch up by reading."

Answer**False.** Text-heavy slides *cause* the distraction they're meant to fix: reading shuts off listening, so a "catch-up" slide makes people stop hearing the speaker (who carries the argument); the real catch-up fallback is a handout or the paper, not the slide. (§18.1)

T3. "Admitting in Q&A that you haven't tested something weakens your credibility, so you should avoid acknowledging gaps."

Answer**False.** Calibrated honesty *raises* credibility: admitting a precise limit shows you know the boundaries of your own evidence (which makes your other claims trustworthy), whereas bluffing — which experts detect — poisons trust in everything; the strong move is "I don't know" plus a reasoned bridge. (§18.6)

T4. "A slide headline like 'Methods' is fine, because the slide's job is just to label what section you're in."

Answer**False.** A topic headline states no point and forces the audience to derive the message while listening (which they can't); an assertion headline ("We tested 12 cells per condition — enough to trust the difference") hands them the takeaway and frees the visual to be the evidence. (§18.2)

T5. "If your talk runs long in rehearsal, speaking faster is an acceptable way to fit the time."

Answer**False.** Speaking faster degrades comprehension exactly at the result, and rarely recovers much time; the fix is to *cut* — drop pre-planned cut slides and secondary findings until a normal-paced version fits ~90% of the slot. (§18.3)

Section 3 — Short Answer

2–4 sentences each.

S1. State the threshold concept of this chapter in one sentence, and explain how it changes the way you build a slide.

Model answer + rubric**Model:** "A slide is not a document; it's a visual aid for a talk you give with your voice, and the audience reads OR listens, never both at once." Once you internalize it, you stop *writing* slides (complete, self-contained text) and start *designing* them: strip the text to a single headline claim, hand the body to one visual, and let your voice carry the explanation. **Rubric:** names the read-OR-listen idea (1) and connects it to stripping text / designing rather than writing (1).

S2. Give the four-part skeleton of a 60-second elevator pitch at a poster, and name where the number goes.

Model answer + rubric**Model:** (1) the problem, (2) what you did, (3) the key result *with the one number*, (4) why it matters + a hook to keep talking. The number belongs in beat 3, the result sentence. **Rubric:** four beats in order (1) and number in the result sentence (1). It's the Specific Aims structure ([Chapter 17](../chapter-17-grant-proposals/index.md)) spoken in a minute.

S3. Explain the difference between compressing and selecting when you cut a 15-minute talk down to 5 minutes, and why one works and the other doesn't.

Model answer + rubric**Model:** Compressing keeps all the points and shrinks each, producing a rushed, shallow version of everything that's intelligible as nothing. Selecting drops most points and gives the one survivor enough room to land — a hook, the result, a pointer to the full version. A 5-minute talk can carry one idea, so you must select. **Rubric:** defines both moves (1) and says selection works because 5 minutes holds one idea (1).

S4. What is "bridging" in a Q&A answer, and why does it make an honest "I don't know" stronger?

Model answer + rubric**Model:** Bridging is following "I don't know" by naming the limit precisely, framing it as future work where true, and offering a reasoned prediction ("I'd expect X because…"). It makes the honest answer stronger because it shows you've thought about the open question and know its boundaries — demonstrating judgment — instead of simply stalling. **Rubric:** defines the bridge (1) and links it to demonstrated judgment / credibility (1).

Section 4 — Applied Scenario

AS1. Here is a slide as a presenter built it:

Slide: "Results." Bullets: "• Capacity retention 94% after 800 cycles • Baseline (LiPON) 80% after 500 cycles • Coulombic efficiency improved 99.1%→99.7% • Interfacial resistance down ~40% • SEM inset shows uniform 50 nm layer."

Redesign it as an assertion–evidence slide. Write the sentence headline, describe the single visual for the body, and say which numbers you'd speak rather than show. Then state, in one sentence, why your version serves the speaker where the original competes with her.

Model answer + rubric**Model headline:** "Our electrolyte holds 94% of capacity after 800 cycles — the prior best held 80% after 500." **Body visual:** one line chart of capacity retention vs. cycle number, two curves (experimental high and flat, baseline dropping early), labeled directly on the plot, the gap shaded; no bullets. **Spoken, not shown:** coulombic efficiency (99.1%→99.7%), the ~40% resistance drop, and the SEM detail — these are absorbed by ear while looking at the chart. **Why it's better (one sentence):** the audience reads one claim in two seconds and looks at one picture that proves it while the speaker supplies the rest, instead of racing through six bullets that shut off listening. **Rubric (score /6):** sentence headline that's a claim (2); single visual as body with direct labels (2); secondary numbers moved to speech + a correct one-sentence rationale (2).

Scoring & Next Steps

Score What it means Do this next
< 50% Core ideas not yet solid Re-read §18.1 (read-or-listen) and §18.2 (assertion–evidence); redo Section 1.
50–70% Partial grasp Redo Part B (Revise This) in the exercises — especially B1 (redesign the slide) and B6 (the pitch).
70–85% Solid; proceed Move to Chapter 19. Optionally do the case studies.
> 85% Strong command Try the Extension exercises (E1–E3) — critique a real poster and a real recorded talk.

The two skills that matter most here: (1) the headline test — a slide headline is a sentence that makes a claim, not a topic; (2) front-loading — the result arrives early, in the first 90 seconds of a talk and in the title of a poster. If you've got those two, you're most of the way there.