Answer to Question #27047 in Statistics and Probability for Bacchus

Question

Use a 0.05 level of significance for all statistical tests:

1.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,
2.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.