An engineer needs to determine if an electrical circuit functions differently at extremely high temperatures. In a sample of 40 measurements taken at room temperature, the average amount of electrical current that passes through the circuit is 30 amps, with standard deviation 3 amps. In a sample of 40 high-temperature measurements, the average amount of current through the circuit is 28 amps, with standard deviation 5 amps. Does this represent a significant difference in performance at the 0.05 significance level?