Researchers are trying to determine the proportion of people…

Researchers are trying to determine the proportion of people who get hip replacements that go on to have a full recovery. Out of a sample of 300 individuals, 102 made a full recovery. Construct and interpret a 95% confidence interval for the proportion of patients that made a full recovery. Previous estimates of patients who recovered fully from surgery sit at a proportion of 0.5. Has the population proportion changed? Please explain.