6.1 Table 6.22 shows the average apparent per capita consumption of sugar

(in kg per year) in Australia, as refined sugar and in manufactured foods

(from Australian Bureau of Statistics, 1998).

Table 6.22 Australian sugar consumption.

Period Refined Sugar in sugar manufactured food 1936–39 32.0 16.3 1946–49 31.2 23.1 1956–59 27.0 23.6 1966–69 21.0 27.7 1976–79 14.9 34.6 1986–89 8.8 33.9

a. Plot sugar consumption against time separately for refined sugar and sugar in manufactured foods. Fit simple linear regression models to summarize the pattern of consumption of each form of sugar. Calculate 95% confidence intervals for the average annual change in consumption for each form.