Esperanto in Scotland, Chapter 1, Exercise 2
Sample answer.

Why it might mislead:
  - The best-documented story is that of one family, the Beveridges in Dundee, so the picture of the whole country may really be the picture of one household and one town.
  - The surviving material is mostly from about 1906 to 1913, so later decades look thin, which may reflect what survives and not what happened.
  - Other towns, and people who did not keep or donate their papers, are under-represented.

What to do about it:
  - Say plainly that the evidence centres on one family and one period.
  - Add other sources: newspapers from other towns, club and Federation reports, periodicals.
  - Treat the Beveridge material as an example, not as the average.
  - Mark claims about the whole of Scotland as uncertain where only Dundee evidence supports them.