Here is Market Basket data for 1,000 transactions at a Drug Store.All transactions involve 1 or 2 drugs.Use the table below to answer the following questions.

-Refer to the table above.What is the definition of confidence for Drug B with reference to Drug A?
A)The probability that Drug A will be purchased.
B)The probability that Drug B will be purchased.
C)The probability that both Drug A and Drug B will be purchased.
D)The probability that Drug B will be purchased given that Drug A has been purchased.

Question

Here is Market Basket data for 1,000 transactions at a Drug Store.All transactions involve 1 or 2 drugs.Use the table below to answer the following questions.
 
-Refer to the table above.What is the definition of confidence for Drug B with reference to Drug A?
A)The probability that Drug A will be purchased. 
B)The probability that Drug B will be purchased. 
C)The probability that both Drug A and Drug B will be purchased. 
D)The probability that Drug B will be purchased given that Drug A has been purchased.

Quizplus · Accepted Answer

Confidence is defined as the probability of buying Drug B given that Drug A has already been bought. Therefore, option D is the correct choice. Options A, B, and C are incorrect as they do not take into account the relationship between Drug A and Drug B.

Here Is Market Basket Data for 1,000 Transactions at a Drug