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Reasons for grouping:

  • saves space
  • easier to look for patterns
  • certain calculations may be performed that are more difficult on un-grouped data

Problems with grouping:

  • may hide patterns if intervals are badly chosen
  • open-ended intervals can be confusing to interpret, for example; Amir earns > £60,000 annually, or Umair spends < £100 weekly.
  • Information may be lost- if only grouped data is published then it may lead to problems in statistical analysis.
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Q: Advantage and Disadvantage of group data?
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