Logical Reasoning

PT157 · S3 · Q7 News report: Some recently invented

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News report: Some recently invented television screens are built out of small tiles seamlessly joined together, each tile a separate miniature screen.

Given

Some recently invented television screens are built out of small tiles seamlessly joined together.

Each tile is a separate miniature screen.

Television sets with these compound screens are just a few inches thick.

For a noncompound screen in a set of this thickness, the larger the screen is, the dimmer it is.

However, each tile in a compound screen is small enough to be quite bright.

Moreover, an unlimited number of the tiles can be joined together, without making the resulting screen any less bright or the set any thicker.

Evaluate

The stimulus provides a comparison between noncompound screens and the new, recently invented compound screens.

A noncompound screen that is just a few inches thick will get dimmer as it is made larger. However, since each tile in a new compound screen is bright, and an unlimited number of tiles can be joined together without reducing the brightness, it follows that the new compound screens can be made very large without becoming dimmer.

Also, joining tiles together doesn't make the new compound screens any thicker, so we can make large, bright compound screens that are still only a few inches thick.

7.

Which one of the following can be properly inferred from the information in the news report?

  1. The technology used to make

    Unsupported Distinction

    Nothing suggests compound screen technology is inappropriate for small screens. The ability to go large does not mean small is impossible. A few tiles would make a small, bright screen.

    2% picked this

  2. There is a great consumer

    Out of Scope

    The stimulus describes technological capability but says nothing about consumer demand. Whether consumers want these TVs is a market question the stimulus does not address.

    3% picked this

  3. In a television set with

    Unsupported Relationship

    The stimulus describes the size-brightness relationship at one thickness. It does not describe how changing thickness affects brightness. "The thicker the set, the brighter the screen" asserts an unbounded correlation the stimulus cannot support. Maybe thickness helps to a point, maybe not.

    6% picked this

  4. Correct

    Television sets that are just

    Why this is right

    This follows directly from combining premises. Compound screens are a few inches thick. Each tile is bright. Unlimited tiles can be added without losing brightness or gaining thickness. Therefore: thin TVs can now have screens that are both bright and very large. Each element of this answer corresponds to a supported proposition, and the conjunction follows without additional assumptions.

    Skill tested: Must be True · how this choice captures the argument's function is the move to repeat next time.

    81% picked this

  5. Television sets with compound screens

    Too Speculative

    The stimulus describes advantages of compound screens but never claims they have no disadvantages. There could be many drawbacks not mentioned: higher cost, lower resolution, visible seams, shorter lifespan. Silence on disadvantages does not prove their absence.

    8% picked this

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