My study : effect of mixed land use on quality of life. I am taking 10 areas in the city with different amount and kind of mixed landuses and calculating an index for mixed landuse. Mixed landuse is the independent variable. (external factors like density, location etc are also into play and will be treated as separate independent variable) I want to compute quality of life index for all those areas by taking people's satisfaction survey on a 7 point likert scale ( 30 samples from each area). Later I want to run a spearman rank co-relation to check.
But can I measure Quality of Life of people and use it without informing the people about mixed landuses? suggest me some reference of casual research from the field of urban environment/ urban planning.