In a random sanple of 500 students, 80% say they have a part-time job. An approximate 95% confidence interval for the proportion of students with part-time jobs is?
1. (0.758;0.842)
2. (0.765;0.835)
3. (0.770;0.830)
4. (0.800;0.835)
5. (0.782;0.819)