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It turns it out it's not much of an indicator of anything. Since first hearing about the study, I embarked on a study of my own, starting with guitarists, and then extending to just about everyone I met or saw.
</snip>
The trouble with your study, and theirs, isn't with the size of the finger but the size of the sample. I'd love to see the results of yours get press though. There would be something oddly satisfying about a headline which read Study Finds No Particular Correlation Between Finger Sizes and Skill Sets. More satisfying, though, would be one that read Study Finds Researchers and Reporters Unduly Influenced by Statistical Anomalies. And neither would be a good name for a band.