The Alex Bolt Company produces half-inch bolts that have a mean tensile strength of more than 4000 lbs (the specified quality standard). A sample of 35 bolts is selected and put under pressure to test their tensile strength. Average tensile strength of the 35 bolts was 4014 lb/in2 with sample standard deviation of 20 lb/in? What confidence interval should be used to determine if this standard is met?

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