There are 5,000 students enrolled in a college

• September 1, 2020: 275 students showed symptoms of psychological stress.
• September 15, 2020: 325 students werefound to have psychological stress symptoms.These 325 students included all 275 who were stressed on September 1.
• September 25, 2020: 400 students were found to have symptoms of stress. These400 included all 325 who were stressed on September 15.

Answer the following questions.For questions involving computations, please show all the steps for partial points. Please mention the appropriate unit depending on the multiplier that you use (%,orper 1000 , or per 100,000 people at risk) to earn full points.

1. Computetheprevalenceproportion of stress in this college onSeptember 25, 2020.(1)
2. Interpretthe prevalence proportion you just computed (how would you explain the result to someone who is not familiar with the concept of prevalence). (1)
3. Computetheincidenceproportion of stress among students in this college betweenSeptember 15 and September 25.(2)
4. Computetheincidenceproportion of stressamong students in this collegebetweenSeptember 1 and September 25. (2)
5. Interpretthe incidence proportions you just computed (how would you explain the results to someone who is not familiar with the concept of incidence). (2)
6. What is an importantlimitationof incidence proportion, that canbe addressed by using incidence rate?In this example, what additional information would be needed to compute incidence rate?