Now that you have the standard deviation-volatility idea down, you can roll right on to Bollinger bands for a practical way to put what you know to work. When I first looked at charts with Bollinger bands, it seemed as though they were drawn on top of prices. How they predicted anything was not at all obvious. But the Bollinger band is a variation of standard deviation. Instead of being calculated from closing prices, it’s based on a 20-day moving average. The normal setting is 20…

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