Which of the following is the BEST example of faulty reasoning? a. Rachel bought a new car last week. She's been suffering from allergies for the last four days. Rachel is allergic to her new car. b. Jonathan received an A on his exam. All of the other students in his class received B's and C's. Jonathan received the highest grade in the class. c. Marcus ran the 100 meter dash in 10 seconds flat. None of the other runners in the race broke 11 seconds. Marcus won the race. d. Gertrude came down with strep throat. After taking antibiotics, Gertrude's symptoms went away. The antibiotics cured Gertrude's strep throat.
Question
Which of the following is the BEST example of faulty reasoning? a. Rachel bought a new car last week. She's been suffering from allergies for the last four days. Rachel is allergic to her new car. b. Jonathan received an A on his exam. All of the other students in his class received B's and C's. Jonathan received the highest grade in the class. c. Marcus ran the 100 meter dash in 10 seconds flat. None of the other runners in the race broke 11 seconds. Marcus won the race. d. Gertrude came down with strep throat. After taking antibiotics, Gertrude's symptoms went away. The antibiotics cured Gertrude's strep throat.
Solution
The best example of faulty reasoning is:
a. Rachel bought a new car last week. She's been suffering from allergies for the last four days. Rachel is allergic to her new car.
This is faulty reasoning because it assumes a cause-and-effect relationship between two events that happened around the same time. Just because Rachel started suffering from allergies after buying a new car, it doesn't necessarily mean that the car is the cause of her allergies. There could be other factors at play, such as a change in weather, a new perfume, or a new laundry detergent. This is a common logical fallacy known as post hoc ergo propter hoc, or "after this, therefore because of this."
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