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Question: Modeling with data the following data gives the number of computer-security incidents (in thousands), including computer viruses and intrusions, in which the same tool is used by an intruder, from 1999 through 2003.
A. Use quartreg to find a fourth-degree polynomial regression model for the data. Let t 0 correspond to 1999.
B. Show that the number n(t) of computer-security incidents was always increasing between 2000 and 2003. Hint: plot the graph of n' and show that it always lies above the t-axis for 1 t 4.
C. Show that between 2000 and 2001, the number of computer-security incidents was increasing at the fastest rate in the middle of 2000 and that between 2001 and 2003 the number of incidents was increasing at the slowest rate in the middle of 2001.
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