This test is to be written in the BSB Computer Lab. The duration of the test is 2 hours.

Any calculators and one sheet of notes (8.5" x 11", one side only) are permitted. You may refer to the STATS 3N03/3J04 2003-2004 web site, but you may not consult any other web pages or e-mail.

Use R to do your analyses and draw graphs. Your response to each question should be in the form of a report. Prepare the report in a word processor, integrating graphics and discussion. Print out and submit your report at the end of the test period. Only printed reports will be accepted. Electronic submissions will not be accepted.

1. The file solubility.xls presents data on the observed mole fraction solubility of a solute at a constant temperature, and the dispersion, dipolar, and hydrogen bonding Hansen partial solubility parameters. The first column of the spreadsheet is the negative log of mole fraction solubility, the remaining three columns are the solubility parameters in the order given above. Do an exploratory data analysis to see which solubility parameters might be useful for predicting mole fraction solubility. Discuss the effect of any extreme values.

    

2. This data file airquality.xls contains selected monthly mean CO₂ concentrations at the Mauna Loa Observatory from 1974 to 1987. The CO₂ concentrations were measured by the Geophysical Monitoring for Climatic Change division of NOAA's Air Resources Laboratory. Each line contains the CO₂ concentration, the year, the month, and a numeric value for the combined month and year. This combined date is useful for plotting purposes.

   Conduct a thorough analysis of this data set. What conclusions can you draw about the data? What conclusions can you draw about air quality (i.e. CO₂ concentration) over this period of time? Do any factors other than time affect the air quality?

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Statistics 3N03/3J04