8. Because of an influx of nonconforming bolts, an aircraft manufacturer decides to check the ultimate strength of four different size bolts in their last order using a tensile testing machine. Based on the following data, use an appropriate a level to determine if there is significance. Furthermore, if the ultimate strength should be greater than 120 kip/in2, identify the bolt size(s) that you feel may be nonconforming.

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Bolt Diameter (in) Strength (kip/in) 0.250 120 123 122 119 0.375 131 128 126 140 0.500 115 124 123 120 0.625 118 119 121 120