# Satisfied Customers Simulation (1-prop z)

- Author:
- Steve Phelps

The CEO of a large electric utility claims that 80 percent of his 1,000,000 customers are very satisfied with the service they receive. To test this claim, the local newspaper surveyed 100 customers, using simple random sampling. Among the sampled customers, 73 percent say they are very satisfied. Based on these findings, can we reject the CEO's hypothesis that 80% of the customers are very satisfied?
Each dot in the dot plot represents the number of customers who say they are satisfied out of a random sample of 100 customers, under the assumption that 80% of the customers are satisfied.