please provide steps A food processing company is interested

please provide steps

A food processing company is interested in the proportion p of customers that would try a new product. How many customers do they need to survey to estimate p to within plusminus 3% with 95% confidence? A pilot sample of 50 measurements of the breaking strength of cotton threads give Sprl = 18 grams. What is the sample size needed to obtain a 90% Cl of length 4?