Support - 30% - Only the riders that are bought together by at least 3 customers are considered.
Confidence - 90% - The association rule has to be true in 90% of the transactions
Case1: (S1, S3) (S2)(S1, S3) was bought by 5 customers but only 3 of them also bought S2.
Confidence is 60%.
Case2: (S1, S2) (S3)(S1, S2) was bought by 3 customers and all 3 of them bought S3 as well.
Confidence is 100%. So this rule has a very strong confidence (above 90%) and has to be
considered.