Each group has hundreds of stocks within it, so the sample size is very large. The differential between the worst group ($3.00-$4.99) and the best group ($5.00-$9.99) is 5.62% - probably meaningful. The $5-10 group has had better returns 8 of the 10 contests.
Shown below are the 10 contests and the returns for each price group in each contest.
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