1. 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 7T1 2 7T2.
2. In a preliminary study, the U.S. Veterans Affairs Department found that 30.9% of the 81 soldiers who were near an accidental nerve gas release just after the 1991 Persian Gulf War had muscle and bone ailments, compared to a rate of 23.5% for the 52,000 Gulf veterans who were not near that area. Use an appropriate one-tail test and the 0.10 level of significance in examining the difference between these two rates. Determine and interpret the p-value for the test. Source: John Diamond, "Some Veterans Suffer Bone, Muscle Ailments," The Indiana Gazette, January 22, 1997, p. 5.