103 Phishing attacks to e-mail accounts. Chance (Summer 2007) published an article on phishing attacks at a...
Question:
103 Phishing attacks to e-mail accounts. Chance (Summer 2007) published an article on phishing attacks at a company.
P hishing describes an attempt to extract personal/financial information through fraudulent e-mail. The company set up a publicized e-mail account—called a “fraud box”—which enabled employees to notify it if they suspected an e-mail phishing attack. If there is minimal or no collaboration or collusion from within the company, the interarrival times
(i.e., the time between successive e-mail notifications, in seconds) have an approximate exponential distribution with a mean of 95 seconds.
a. What is the probability of observing an interarrival time of at least 2 minutes?
b. Data for a sample of 267 interarrival times are saved in the PHISHING file. Do the data appear to follow an exponential distribution?
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