In two consecutive years, 1000 adults in the magical community
were asked if they believed that Voldemort had returned. The first
year, 43% believed that he had returned and in the second year, 47%
believed that he had returned.
1) Explain why it would be inappropriate to conclude, based on
these percentages alone, that the percentage of adults who believed
that Voldemort had returned increased from the first year to the
second year.
2) Assume that the conditions have been...