A random sample of 441 shoppers revealed that 76% made at least one purchase at the discount store last month.
a) Determine the 90% confidence interval for the population proportion of shoppers who made at least one discount store purchase last month?
b) the city of San, has a population of 35000 people. Referring to part a, determine a 90% confidence interval for the number of shoppers who made at least one discount store purchase last month.