How can I get 2.58

Problem 4. Imagine you are working as a research consultant for a large organization. The organization is interested in examining employee satisfaction (essentially, whether the workers are happy with their jobs). In a survey of 80 randomly selected employees, 60 say that they are happy with their jobs. a. Use the given information to calculate the 99% confidence interval for the population proportion of employeed who feel happy with their jobs. P=60/80=0.75 0.75*0.25 e = 2.58 * = 0.125 80 The confidence interval (0.625, 0.875) b. Please write a thorough interpretation of the 99% confidence interval in (a). We have 99% confidence to say that in the large organization, at least 62.5% of the employees and at most 87.5% employees are happy with their jobs. c. Can you conclude that at least 70% of the employees are happy with their jobs