Page 182 - Data Science class 11
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4.  What is the difference between probability sampling and non-probability sampling?
          Ans.  Probability sampling: It involves random selection, allowing you to make strong statistical inferences about the whole
              group.
              Non-probability sampling: It involves non-random selection based on convenience or other criteria allowing you to
              easily collect data.
            5.  Write a note on NPS-Net Promoter Score Survey.
          Ans.  It is a customer loyalty and satisfaction measurement taken by asking customers various questions. It is a powerful
              metric used across business of varying sizes. It helps companies achieve its objective of earning more enthusiastic
              customers and the score itself can be easily tracked and quantified over time.


                                              Unsolved Exercise



             Objective Type Questions (Section A)


        A.  Tick ( ) the correct option.
            1.  Which of the following statement is false?
              a.  Yes/No is an example of close ended question in a survey.

              b.  A rating scale of 1–10 is an example of close ended question in a survey.
              c.  A multiple-choice option is an example of close ended question in a survey.
              d.  Suggesting improvement is an example of close ended question in a survey.

            2.  Out of the options given below, which one can be selected to be associated with survey research?
              a.  The problem of objectivity                     b.  The problem of "going native"

              c.  The problem of omission                        d.  The problem of robustness
            3.  Mr. X conducted a study of the way restaurant owners granted or refused access to a couple. This is an example of
              observing behaviour in terms of:
              a.  Individuals                                    b.  Incidents
              c.  Short time periods                             d.  Long time periods

            4.  The statement "results are accurate within +/-4 p.p., 95% of the time" refers respectively to:
              a.  confidence level and confidence interval
              b.  confidence interval and confidence level

              c.  margin of error and margin of confidence
              d.  sample interval and confidence level
            5.  Greater dissimilarity within the population of interest will:
              a.  Increase the confidence interval               b.  Decrease the confidence interval

              c.  Will have no impact on confidence interval       d.  None of these

            6.  Which of the following is a method of data collection by sensing?
              a.  Use of speed guns to measure the speed of vehicles by traffic police.
              b.  Performing surveys to calculate the population of the country.
              c.  Performing experiments and observing the results.

              d.  None of these
          180   Touchpad Data Science-XI
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