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Answer to Question #26478 in Statistics and Probability for Bacchus

Question #26478
Use a 0.05 level of significance for all statistical tests:

7.A statistical test to see whether the proportion of customers who would recommend the Credit Union to their friends have increased as a result of the pilot,
8.A 90% confidence interval for the difference of the proportions, before and after the pilot, of customers who would recommend the Credit Union to their friends.
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