Logical Reasoning

PT130 · S1 · Q20 A person with a type B

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A person with a type B lipid profile is at much greater risk of heart disease than a person with a type A lipid profile.

Given

A person with a type B lipid profile is at much greater risk of heart disease than a person with a type A lipid profile.

In an experiment, both type A volunteers and type B volunteers were put on a low fat diet.

The cholesterol levels of the type B volunteers soon dropped substantially, although their lipid profiles were unchanged.

The type A volunteers, however, showed no benefit from the diet, and 40 percent of them actually shifted to type B profiles.

20.

If the information above is true, which one of the following must also be true?

  1. In the experiment, most of

    Unsupported

    While it must be true that some of the volunteers had their risk of heart disease increase, those who originally had type B profiles remained with type B profiles and for them no change in their risk of heart disease can be inferred. For the those who originally had type A profiles, 40 percent of them had their risk of heart disease increase since their profiles switched to type B. For the remainder of type A profiles, no change can be inferred.

    3% picked this

  2. People with type B lipid

    Supports a Premise

    This could explain why people with type B profiles have a higher risk of heart disease, though this does not have to be true.

    8% picked this

  3. Apart from adopting the low-fat

    Out of Scope

    Other changes to lifestyle are not discussed in the statements.

    5% picked this

  4. The reduction in cholesterol levels

    Too Strong

    This could be true, but there could be factors other than the reduction of cholesterol levels that contributed to their lipid profile changing.

    3% picked this

  5. Correct

    For at least some of

    Why this is right

    Since 40 percent of the type A volunteers shifted to type B profiles and a person with a type B lipid profile is at much greater risk of heart disease than a person with a type A lipid profile, it follows that for some volunteers the risk of heart disease increased after having been put on the low-fat diet.

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

    81% picked this

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