A telephone sales solicitor, trying to decide between two alternative sales pitches, randomly alternated between them during a day of calls. Using approach A, 20% of 100 calls led to requests for the mailing of additional product information.
For approach B in another 100 calls, only 14% led to requests for the product information mailing.
At the 0.05 level, can we conclude that the difference in results was due to chance? Determine and interpret the p-value for this test, then construct and interpret the 95% confidence interval for π1 - π2.