Question

Discuss about the following topics that can be studied using correlation study method:

1. Bunking lectures and score in exams
2. Weight and intelligence
3. Amount of salary and level of job satisfaction
4. Rehearsal and forgetting
5. Height and aptitude in music
6. Urbanization and pollution
7. Speed of vehicles and road accidents

Answer 1

1. Bunking lectures and score in exams: This typically exhibits a negative correlation. As the frequency of skipped classes increases, academic performance and exam scores tend to decrease, though confounding variables like independent textbook study can weaken the association.
2. Weight and intelligence: This demonstrates zero correlation (or no statistical relationship). Physical body weight has no biological or psychological predictive link to a person’s cognitive capability or intelligence quotient.
3. Amount of salary and level of job satisfaction: This generally shows a positive correlation. Higher compensation often aligns with better job satisfaction, though the relationship tends to plateau once basic financial security and market-rate valuations are achieved.
4. Rehearsal and forgetting: Studying rehearsal time against memory retention reveals a negative correlation regarding forgetting (or a positive one regarding memory). As the amount of deliberate rehearsal increases, the rate of memory decay decreases due to cognitive consolidation.
5. Height and aptitude in music: This yields zero correlation. Physical stature is entirely independent of an individual’s innate or developed musical talent, rhythm, and auditory processing skills.
6. Urbanization and pollution: This exhibits a strong positive correlation. Rapid urban expansion, industrial growth, and concentrated vehicular density in cities directly scale up air, water, and noise pollution levels.
7. Speed of vehicles and road accidents: This displays a direct positive correlation. Higher average driving speeds increase both the probability of a collision occurring and the kinetic energy, thereby raising the severity of injuries sustained upon impact.