1. Explain the distinctions between the R commands capture.output, dput, dump, save, sink, and write, and illustrate those distinctions in examples of your own.
2. In conjunction with the discussion of the function var producing NA on page 15, explain the role of the option na.rm in this function and why it does not help with the issue. Describe the role of the option na.action in the functions lm and glm.