Question: The article Ultimate Load Capacities of Expansion Anchor Bolts (J. of Energy Engr., 1993: 139158) gave the following summary data on shear strength (kip) for

The article “Ultimate Load Capacities of Expansion Anchor Bolts” (J. of Energy Engr., 1993: 139–158) gave the following summary data on shear strength (kip) for a sample of 3/8-in. anchor bolts: n 78, x 4.25, s 1.30. Calculate a lower confidence bound using a confidence level of 90% for true average shear strength.

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