Can someone please help me with this? I've missed it twice. I don't know what I am doing wrong & I need help ASAP. PLEASE

(22.51) 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 14 counties in central Indiana. For various reasons, the study got no response from 47 % of the businesses chosen. Interviews were completed with 158 businesses. Three years later, 20 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 =_____.