Biostatistics Homework

• Are there differences among university students age groups (18–29 years, 30–44 years, and 45+ years) in terms of their perception of stress? The researcher already asked about age and also used a scale that measures perception of stress, which is a summative rating scale with 20 items. 
• What is the impact of age group and gender on perception of stress among university students? Is the effect of age on perception of stress depends on gender?

The data is attached.