Last year, a fast-food chain filled 85% of its orders correctly for its customers. This year it has developed a new process to increase the percentage. A sample of 200 customers is selected and 188 of the orders are filled correctly.
What is the population? What is the sample?
At the α = 0.05 level of significance, determine whether there is evidence that the population proportion for the new process is higher than the previous 85%.