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Greetings, Fools. It's once again time to divine -- with quite a degree of accuracy -- which stocks will be making big moves on Wall Street in the week ahead. Last time I made such a prediction, the average stock moved 19% on the date I predicted. This week, I believe that shares of on-line car-buying specialist TrueCar (NASDAQ:TRUE), retailer Nordstrom (NYSE:JWN), and Sam Adams' parent Boston Beer (NYSE:SAM) will be the big movers.

Why do I think this? Because all three of these companies are heavily shorted --or have investors betting against them -- and all three are reporting earnings. When these two forces combine, volatility is almost always the result.

But I don't suggest trying to make a quick fortune based on this information. You can just as easily lose a quick fortune. Instead, I think current shareholders need to be prepared for the volatility, and be able to differentiate between noise, and an actual signal in the week ahead. That's what's included in the slideshow below.

Photos: TrueCar, Nicholas Eckhart--via Flickr, Boston Beer.

Brian Stoffel has no position in any stocks mentioned. The Motley Fool owns shares of and recommends Boston Beer. The Motley Fool recommends Nordstrom and TrueCar. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.