The article Influence of Penetration Rate on Penetrometer Resistance (J. Oliveira, M. Almeida, et al., Journal of

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The article “Influence of Penetration Rate on Penetrometer Resistance” (J. Oliveira, M. Almeida, et al., Journal of Geo technical and Geo environmental Engineering, 2011:695–703) presents measures of penetration resistance for a certain fine-grained soil. Fifteen measurements, expressed as a multiple of a standard quantity, had a mean of 2.64 and a standard deviation of 1.02. Find a 95% confidence interval for the mean penetration resistance for this soil.

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