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 not consult any 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.
Do a graphical analysis of the following data from a study to determine the effect of different plate materials and ambient temperature on the effective life (in hours) of a storage battery. There were 3 replicates at each combination of material and temperature.
Ambient temperature
low medium high
Plate material 1 130, 74, 155 34, 80, 40 20, 82, 70
2 150, 159, 188 136, 106, 122 25, 58, 70
The file gasdata.xls concerns the relationship between daily natural gas consumption and weather in a city. For each of 63 consecutive days, it gives the "sendout" (the amount of gas consumed), the "degree heating days" (dhd = 65 - average temperature for the day in Fahrenheit), the lagged dhd, wind speed, and an indicator for weekend (0 = weekday, 1 = weekend). Do an exploratory data analysis and explain what you can conclude.