Answer:
1) Inappropriate sample selection due to lack of adequate demographic data. The company shouldn't have surveyed all the families since it needed to survey only families with kids. If they didn't have the information necessary for determining who they should survey or not, they could include an initial question regarding if they have children or not.
2) Germany is the country that has enacted the most stringent green marketing laws that regulate the management and recycling of packaging waste.
3) Cho experienced problems with the use of improper colloquialisms or slang.