18. The article Ultimate Load Capacities of Expansion Anchor Bolts (J. Energy Engrg., 1993: 139158) gave the

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18. The article Ultimate Load Capacities of Expansion Anchor Bolts (J. Energy Engrg., 1993: 139—158)

gave the following summary data on shear strength

(kip) for a sample of 3/8-in. anchor bolts: n  78,

, s  1.30. Calculate a lower con dence bound using a con dence level of 90% for true average shear strength.

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