10.39 Shear-strength measurements derived from unconfined compression tests for two types of soils gave the following results (measurements in tons per square foot):

Do the soils appear to differ with respect to average shear strength, at the 1% significance level?

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Soil Type I n = 30 Soil Type II n = 1.65 S = 0.26 = 40 = X2 1.43 $2 = 0.22