NPTEL | DATA MINING | WEEK-2

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NPTEL

DATA MINING

WEEK-2

  1. If a store has N items, the number of possible itemsets is

    1. 2N-1

    2. 2N-1

    3. N/2

    4. N-1


  1. An association rule is valid if it satisfies:

    1. Support criteria

    2. Confidence criteria

    3. Both support and confidence criteria

    4. None of these


  1. An itemset is frequent if it satisfies the:

    1. Support criteria

    2. Confidence criteria

    3. Both support and confidence criteria

    4. None of these


  1. Which of the following property is used by the apriori algorithm:

    1. Positive definiteness property of support

    2. Positive semidefiniteness property of support

    3. Monotone property of support

    4. Antimonotone property of support


  1. Consider three itemsets I1={bat, ball, wicket}, I2={bat, ball}, I3={bat}. Which of the following statements are correct?

    1. support(I1) > support(I2)

    2. support(I2) > support(I3)

    3. Both statements A and B

    4. None of statements A and B


For questions 6-10, consider the following small database of four transactions. The minimum support is 60% and the minimum confidence is 80%.

Trans_id              Itemlist

T1                          {F, A, D, B}

T2                          {D, A, C, E, B}

T3                          {C, A, B, E}

T4                      {B, A, D}


  1. The 1-itemsets that satisfy the support criteria are:

    1. {A}, {B}, {C}, {D}

    2. {A}. {B}, {C}

    3. {A}, {B}

    4. None of these


  1. The 2-itemsets that satisfy the support criteria are:

    1. {BC}, {BE}, {CE}, {AE}

    2. {AB}, {BD}, {AD}

    3. {AE}, {BC}

    4. {BC}


  1. The 3-itemsets that satisfy the support criteria are:

    1. {ABC}, {ABE}, {BCD}, {ACD}

    2. {ABE}. {BCD}, {ACD}

    3. {ABE}, {BCD}

    4. {ABD}


  1. Which of the following is NOT a valid association rule?

    1. A -> B

    2. B -> A

    3. A -> D

    4. D -> A


  1. Which of the following is NOT a valid association rule?

    1. A -> DB

    2. D -> AB

    3. AD -> B

    4. DB -> A

Updated on February 02, 2023, at 12:40 AM

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