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Empirical Rule There is only a 0.5% chance that more than 316 robberies would occur on any given weekday but 343 robberies occurred on a Friday in the first quarter of 2009!
Box and Whisker Plot Fridays in the first quarter of 2009 were the only outlier observed in the data analyzed.
Setting the Record What are the chances we will see another weekday with 343 or more robberies?
Hypothesis Test The FBI are developing their 2012 Fiscal Year budget and need to know how many special agents to train in bank robbery investigation. The mean number of robberies per weekday decreased to 191.3 over the last two quarters. Can the FBI safely assume that the number of robberies is decreasing with a significance of 0.02?
Confidence The Director of the FBI has requested that the agency be able to handle the average case load the vast majority of the time. Between which means can the agency expect the number of robberies to fluctuate 98% of the time?