Page 220 - Data Science class 10
P. 220

iii.   Choose the correct set of matches.
                   (i) Selection Bias       (A) Focusing on successful examples and ignoring the failure.
                   (ii)Linearity Bias       (B) Recommendation Systems
                   (iii)Survivor Bias       (C) Common at the data labeling stage of any object
                   (iv) Recall Bias         (D) Cognitive Bias

                 a.  (i)-(A), (ii)-(B),(iii)-(C), (iv)-(D)       b.  (i)-(B), (ii)-(D),(iii)-(C), (iv)-(A)
                 c.  (i)-(B), (ii)-(D),(iii)-(A), (iv)-(C)       d.  (i)-(B), (ii)-(A),(iii)-(D), (iv)-(C)

              iv.  Which of the following formula is used to calculate the z-score?

                 a.  (x-μ)/σ                                     b.  (μ-x)/σ
                 c.  (σ-μ)/x                                     d.  (μ- σ)/x

              v.   i.  The z-score is always negative if the value of z-score lies above the mean.
                 ii.  The z-score is positive if its value is below the mean.
                 iii.  The z-score is always positive if the value of z-score lies above the mean.
                 iv.  The z-score is negative if its value is below the mean.
                 Identify the correct statements.
                 a.  i and ii                                    b.  i and iv

                 c.  ii and iii                                  d.  iii and iv

              vi.  Which of the following is not an appropriate way of discarding confidential data?
                 a.  Shredding the data
                 b.  Cutting the files which contain confidential data

                 c.  Burning the confidential data
                 d.  Crumbling the papers which contain confidential data and throwing it in the dustbin

        Q. 4.  Answer any 5 out of the given 6 questions                                         (1 × 5 = 5 marks)
              i.     Statement1: Mean Absolute Deviation (MAD) is the average of how far away all values in a data set are from the
                 mean.
                 Statement2: The Standard Deviation is the measure of how spread out the numbers are around the mean.
                 a.  Both Statement1 and Statement2 are correct

                 b.  Both Statement1 and Statement2 are incorrect
                 c.  Statement1 is correct but Statement2 is incorrect

                 d.  Statement2 is correct but Statement1 is incorrect
              ii.     What is the probability that in a pack of 52 cards, the card taken is 5?

                 a.  4/52                                        b.  1/26
                 c.  8/52                                        d.  1/169

              iii.  Bias data can have the following properties:

                 (i)  Partial                                   (ii)  Prejudiced
                 (iii)  preferential                            (iv)  selective

                 a.  i, iii and iv                               b.  ii, iii, and iv
                 c.  i, ii and iii                               d.  i, ii and iv
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