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The following is the summary of a survey on the colour of


The following is the summary of a survey on the colour of pens purchased by persons belonging to different age groups. Use chi-square test at 5% level of significance to find whether the age of the person has any association with the choice of colour.

  1. Colour age group Blue Black Red
  2. Less than 20 8 12 20
  3. 20-50 10 15 10
  4. Above 50 10 10 5

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