you work for a large retailer and have been asked to estimate the proportion of your customers at are less than 30 years old you have sampled a large number of stories and have found that 173 customers you have surveyed 61 are less than 30 years old assuming your sample is valid what is the upper bound of a 95% confidence interval for the population proportion of customers who are less than 30 years old before your answer is it a small not as a percentage