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deviation 1.784. Computed t=2.913. Has there been a statistically significant change in the mean length of the bars? 1500 randomly selected pine trees were tested for traces of the Bark Beetle infestation. It was found that 153 of the trees showed such traces. Test the hypothesis that more than 10% of the Pine trees have been infested. (Use a 5% level of significance). deviation 1.784. Computed t=2.913. Has there been a statistically significant change in the mean length of the bars? 1500 randomly selected pine trees were tested for traces of the Bark Beetle infestation. It was found that 153 of the trees showed such traces. Test the hypothesis that more than 10% of the Pine trees have been infested. (Use a 5% level of significance)