On the Caribbean island

Answer choices

1. A

   Correct94% picked this

   For many of the atypical Parkinson's patients, their symptoms stopped getting worse, and in some cases actually abated, when they stopped eating

   Why this is right

   One shows that when the presumed cause is absent, the presumed effect is absent as well. This strengthens the correlation, which does make the causal relationship more likely to be true.

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

   94%
2. B

   Too Weak2% picked this

   Of the healthy adults who did not regularly eat soursop, custard apple, and pomme cannelle, most had eaten each of these fruits

   This is too weak to undermine the correlation between those who regularly eat these tropical fruits and atypical Parkinson’s.

   2%
3. C

   Weaken1% picked this

   In areas other than Guadeloupe, many people who have never eaten soursop, custard apple, and pomme cannelle

   This makes it less likely that these fruits are the culprit since this weakens the correlation between atypical Parkinson’s and these fruits.

   1%
4. D

   Weaken1% picked this

   The 10 healthy adults who regularly ate soursop, custard apple, and pomme cannelle ate significantly greater quantities of these fruits, on average, than

   This makes it less likely that these fruits are the culprit since this weakens the correlation between atypical Parkinson’s and these fruits.

   1%
5. E

   Weaken2% picked this

   Soursop, custard apple, and pomme cannelle contain essential vitamins not contained in any other food that is commonly

   This makes these fruits less likely to be the culprit since they contain essential vitamins, something common sense would suggest is healthy.

   2%