Page 149 - Data Science class 11
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7.  Using observational data is best in which of following situations:
                  a.  You need to gather sensitive information, and you don’t trust your participants to be honest with their
                     self-reporting.
                  b.  You need to understand the how or what of your consumer requirements.

                  c.  The new business strategic topic is new, and you need robust data.
                  d.  All of the situations listed above

               8.  Which of the following is not true?
                  a.  Observation is a way of gathering data by watching behaviour, events, or noting physical characteristics in
                     their natural setting.
                  b.  An observation uses your five senses, while an inference is a conclusion you draw based on your observations.
                  c.  Examining all employees for loyalty.

                  d.  Observations can be overt or covert.
               9.  If the actual demand for a period is 100 units but the forecast demand was 90 units, the error in the forecast is:
                  a.  -10                                            b.  +10

                  c.  -5                                             d.  +5
               10.  Which of these is not true?
                  a.  Observational study is cheap.

                  b.  Observational study replaces interviewing.
                  c.  Observational study is time consuming.

                  d.  Observational study requires operational definition.
               11.  Which of these would make an observational study unethical?
                  a.  Putting an observer in danger

                  b.  Making use of multiple observers
                  c.  Failure to obtain consent from those being observed

                  d.  Carrying out the observation late at night.
               12.  The observer’s reliability is improved by:
                  a.  Educating observers
                  b.  Using operational definitions

                  c.  Limiting observations to specific time intervals
                  d.  All of the above

            B.  Fill in the blanks.

               1.  In ______________________, the subject is assigned to a random treatment and control group.
               2.  The three types of methodologies to conduct observational research is ______________________, ______________________ and
                  ______________________.
               3.  ______________________ of the UK’s Medical Research Council published a scientific paper based on observational study.

               4.  In ______________________ studies, one or more factors are altered and effects are examined.
               5.  Forecasting calls for a lot of ______________________ gathering, ______________________ and ______________________.




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