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Shear strength measurements derived from unconfined compression tests

for two types of soils gave the results shown in the following table (measured in tons per square foot).
Soil Type 1: n1 = 31 - x1 = 1.56 - s1 = 0.24
Soil Type 2: n2 = 35 - x2 = 1.47 - s2 = 0.21
(a) Do the soils appear to differ with respect to mean shear strength? Use the critical value method at the 5% significance level.
(b) Create a 95% confidence interval on the mean difference. Does this confidence interval come to the same conclusion as your result in part a)?

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