2. Research in Smoking Behaviours (30%)
*When the questions ask you to explain in 'plain language', it means your descriptions should 'let everyone who never studies statistics understand what you say'.
We were interested in understanding smokers' behaviours, so we conducted a survey, collecting data via a questionnaire with variables such as gender, age, number of cigarettes smoked per week, number of friends who smoke etc. The number of samples is 81. The followings are the given calculations:
- average number of cigarettes smoked per week: 78.70
-standard deviation of the number of cigarettes smoked per week: 68.21
- correlation coefficient for age and number of cigarettes smoked per week: 0.29
Based on the above information, please: