Answer: The article “Influence of Penetration Rate on
Chapter 6, Problem 3E(choose chapter or problem)
The article “Influence of Penetration Rate on Penetrometer Resistance” (J. Oliveira, M. Almeida, et al., Journal of Geotechnical and Geoenvironmental Engineering, 2011:695–703) presents measures of penetration resistance, expressed as a multiple of a standard quantity, for a certain fine-grained soil. Fifteen measurements taken at a depth of 1mhad a mean of 2.31 with a standard deviation of 0.89. Fifteen measurements taken at a depth of 2m had a mean of 2.80 with a standard deviation of 1.10. Can you conclude that the penetration resistance differs between the two depths?
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