Given a customer buying electronics database, and 10,000 transactions are analyz

Question

Given a customer buying electronics database, and 10,000 transactions are analyzed and the data show: 6,000 of customer transactions included computer games (game) 7,500 of them included videos (video), 4,000 of them included both computer games and videos The generated association rule is: game -> video [support = ?%, confidence = ?%] Which one of the following statements is correct?

a. It shows the game and video are not positively associated or correlated.

b. It shows the game and video are independent to each other.

c. It shows the game and video are not negatively associated or correlated.

d. The customers who buy computer games also buy video.

Explanation / Answer

Answer)

Lift between occurrence of A and B = P(A U B)/P(A)P(B)

Here the P({game}) = 0.60.

P({video}) = 0.75.

So,

Lift between occurrence of game and video =

0.40/(0.60 × 0.75) = 0.89

Since this value is <1, thus there is negative correlation between occurrence of {game} and {video}.

Thus the occurrence of {game} is negatively correlated with the occurrence of {video}.

Thus from the above statements, the below are correct:

a. It shows the game and video are not positively associated or correlated.

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