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/in2. What confidence interval should be used to determine if this standard is met? Question 19 options: One sample t-interval on the mean, One sample z-interval on the mean