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The purpose of sampling is to form a distribution of individuals or cases that represents the population considered for the study. The sampling methodology that can be applied in this case would be stratified random sampling and multi-stage sampling. Since, 150 individuals are to be taken from the age group of 15 to 19 years, first of all demographic data needs to be analyzed as to what is the proportion of males and females in the entire Australian adolescent population in the age range of 15 to 19 years and if possible in each age category. The proportion of males and females could be like wise taken in the sample. Not only on the basis of gender, the males and females must be selected in the sample so as to represent the proportions of alcoholism, occupation, smoking, body mass index and metabolic rates prevalent in the population under study. This would form a sample that will not only represent the study population effectively but will also reduce the chances of bias that could be associated in the study.
The association between one quantitative and one qualitative (metabolic rate and occupation respectively) variable may be best compared by side-by-side box plots across the categories. Once again we may draw an OLS regression model to determine the strength of association and the direction of association.
The association between two qualitative variables(s…
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