Many people believe that they can tell the difference between Coke and Pepsi. Other people say that the two brands can't be distinguished. To test this, a random sample of 20 adults was selected to participate in a test. After being blindfolded, each person was given a small taste of either Coke or Pepsi and asked to indicate which brand soft drink it was. If people really can't tell the difference, the expected number of correct identifications in the sample would be:
A) 10.
B) 0.
C) between 4 and 9.
D) Can't be determined without more information.

Question

Quizplus · Accepted Answer

If people cannot tell the difference between Coke and Pepsi, guessing would result in a 50% chance of being correct. Therefore, with 20 people, the expected number of correct identifications would be 50% of 20, which is 10.

Many People Believe That They Can Tell the Difference Between