Question

The foundation for a building is designed to rest on 100 piles based on the individual pile capacity of 80 tons. Nine test piles were driven into the ground at random locations into the supporting soil stratum and loaded until failure occurred. The following pile capacities (in tons) were determined {80,125,100,110,73,76,79,81,83}

Determine the 99% Confidence Interval for the mean pile capacity based on the basis of unknown variance.

Answer 1

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