Catherine Chao, Director of Marketing Research, Is Evaluating Consumer Acceptance

Multiple Choice

Catherine Chao, Director of Marketing Research, is evaluating consumer acceptance of a new toothpaste package.She plans to use a 95% confidence interval estimate of the proportion of households which prefer the new packages; she will accept a 0.05 error.Previous studies indicate that new packaging has an approximately 70% acceptance rate.The sample size should be at least _______.

A) 27
B) 59
C) 323
D) 427
E) 500