1. For each of the following types of error, either (i) provide an example of it from the Schober et al. (2003) paper, or (ii) quote a particular passage in Schober et al. (2003) that leads one to believe that this type of error might be present, although insufficient informmation is provided to make a certain determination. (Recognizing that a paper is ambiguous is just as important as understanding what it definitively says.) (2 sentence answer for each type of error.)

1a. Measurement or roundoff error


1b. Sampling error


1c. Human or machine error


1d. Bias (either intentional or unintentional)