A classmate claims that he can smell the difference between a Starbucks cup of coffee and a Dunkin' Donuts cup of coffee. You decide to test this claim by blindfolding him and presenting him with two cups of coffee - one from Starbucks and one from Dunkin' Donuts.
-Your classmate guesses the correct brand of coffee in 65 out of 100 trials. Does this convince you that your classmate's claim is true?
A) No, since 65 out of 100 is close to 50%.
B) No, since the classmate did not guess correctly in all 100 trials.
C) Yes, since there is less than a 1% chance of guessing correctly in 65 or more of 100 trials if the classmate was just guessing.
D) Yes, since 65% is greater than 50%.

Question

Quizplus · Accepted Answer

The probability of guessing correctly in 65 or more of 100 trials if the classmate was just guessing is less than 1%. This means that it is very unlikely that the classmate was just guessing, and that he is likely able to smell the difference between a Starbucks cup of coffee and a Dunkin' Donuts cup of coffee.

A Classmate Claims That He Can Smell the Difference Between