Question

17.) A study of the survival of small businesses chose an SRS from the telephone directory's Yellow Pages listings of food-and-drink businesses in 13 counties in central Indiana. For various reasons, the study got no response from 41 % of the businesses chosen. Interviews were completed with 156 businesses. Three years later, 22 of these businesses had failed.

Give a 94 % confidence interval (±0.001) for the percent of all small businesses in this class that fail within three years:

____⩽p⩽____

Based on the results of this study, how large a sample would you need to reduce the margin of error to -0.01 ? n = ____

Answer 1