The habitat selection behavior of the fruitfly Drosophila subobscura was studied by capturing flies from two different habitat sites. The flies were marked with colored fluorescent dust to indicate the site of capture and then released at a point midway between the original sites. On the following 2 days, flies were recaptured at the two sites. The results are summarized in the table. The value of the chi-square statistic for this contingency table is χ2s = 10.44. Test the null hypothesis of independence against the alternative that the flies preferentially tend to return to their site of capture. Let α = 0.01.

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Site of recapture 1l Site of original capture 78 56 II 33 58