**3. Results and Discussion**

#### *3.1. Demographic Profile of the Sample*

The demographic characteristics of the sample are shown in Table 2. In this survey, a total of 18 choice sets are split into three questionnaire types including 6 sets. Thus, a χ<sup>2</sup> test for the condition of homogeneity between respondents was employed. The results demonstrated the alternative hypothesis that the collected data was heterogeneous; it was rejected at the 5% significance level for gender (*p* = 0.980), age (*p* = 0.950), marital status (*p* = 0.694), education (*p* = 0.061), occupation (*p* = 0.497), residence area (*p* = 0.994), and income (*p* = 0.051). Hence, it confirmed that there was no statistical difference regarding key demographic variables between groups according to the questionnaire types.


