what type of study is a pilot study
This is because it may influence the later behaviour of research subjects if they have already been involved in the research. A pilot experiment/study is often used to test the design of the full-scale experiment which then can be adjusted. It is a potentially valuable insight and should anything be missing in the pilot study it can be added to the full-scale (and more expensive) experiment to improve the chances of a clear outcome.
This is a list of lakes in Michigan. The American state of Michigan borders four of the Great Lakes. The number of inland lakes in Michigan depends on the minimum size: there are 62,798 lakes ≥ 0.1 acres, 26,266 lakes ≥ 1.0 acres, 6,537 lakes ≥ 10.0 acres, 1,148 lakes ≥ 100 acres, 98 lakes ≥ 1,000 acres, and 10 lakes ≥ 10,000 acres.