The owner of the West End Kwick Fill Gas Station wished to determine the proportion of customers who use his pay-at-the-pump feature. This feature allows customers to use a credit card at the pump and never enter the station. He surveyed 100 customers and found that 80 paid at the pump.

1. Estimate the value of the population proportion.
2. Compute the standard error of the proportion
3. Develop a 95% confidence interval for the population proportion.
4. Interpret your findings.