Doc Link For The Data Https Docs Google Com Spreadsheets D 1qorja5qwy1dyh7tztvxh

Doc link for the data: https://docs.google.com/spreadsheets/d/1QorJa5qWY1dyH7TzTvXhbHpolBNq4w_TwMJin91nCeA/edit?usp=sharing

Use the data:

  1. Perform a statistical test to see whether the proportion of members who would recommend the Bank to their family and friends have increased because of the change.
  2. Construct a 99% confidence interval for the difference of the proportions, before and after the change, of members who would recommend the Bank to their family and friends.

Prof. Angela

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