[Q] Sample required for CSAT

Imagine you have a 7 point scale for CSAT, eg how satisfied are you with X, where the responses range from Extremely Satisfied to Extremely Dissatisfied.

Given a population of Y, how do you determine how many responses you need for a confidence interval of 95% with 5% error margin when:

  1. Using top 2 box (eg 70% of users were extremely satisfied or moderately satisfied)

  2. Using mean (eg mean was 4.5, where extremely sat = 7 and extremely dissat = 1)

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Nevin Manimala

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