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As a toy seller, you're particularly subject to fad-dependent demand for items that you carry. You want to know what the current sales trajectory is for certain items so that you can estimate whether to increase inventory (for an item that's becoming more popular) or decrease it (so you're not stuck with a lot of stock for something that's no longer selling well).

That pile of research data you've been collecting over the course of many years needs to be analyzed for publication, lest the dictum "publish or perish" become the epitaph for your career. You want to boil down large amounts of raw data to generate summary information and to pull out selected subsets of observations for more detailed statistical analysis.

You're a popular speaker who travels the country to many types of assemblies, such as graduations, business meetings, civic organizations, and political conventions. You give so many addresses that it's difficult to remember what you've spoken on at each place you've been, so you'd like to maintain records of your past talks and use them to help you plan future engagements. If you return to a place where you've spoken before, you don't want to give a talk similar to one you've already delivered there, and a record of each speech would help you avoid repeats. You'd also like to note how well your talks are received. (Your address "Why I Love Cats" at the Metropolitan Kennel Club was something of a dud, and you don't want to make that mistake again the next time you're there.)
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