71 Radioactive lichen. The Lichen Radionuclide Baseline Research project attempted to monitor the level of radioactivity in lichen. Recall that University of Alaska researchers collected nine lichen specimens and measured the amount of the radioactive element cesium-137

(in microcuries per milliliter) in each specimen. (The natural logarithms of the data values are saved in the LICHEN file.) Assume that in previous years the mean cesium amount in lichen was m = .003 microcurie per milliliter. Is there sufficient evidence to indicate that the mean amount of cesium in lichen specimens differs from this value? Use the SAS printout below to conduct a complete test of hypothesis at a = .10.

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Sample Statistics for CESIUM N Mean 9 0.0090 Hypothesis Test Null hypothesis: Alternative: t Statistic 3.725 Std. Dev. Std. Error 0.0049 0.0016 Mean of CESIUM = 0.003 Mean of CESIUM = 0.003 Df Prob > t 8 0.0058