A steel foundry is producing rails for a railroad. A daily sample of eighty rails has a mean length of 10.12 meters and a 95% confidence interval of [10.10, 10.14]. What would the confidence interval be if the sample had contained only twenty rails? Confidence Interval (%) 80 85 90 95 95.4 99 99.5 99.7 99.9 -value 1.282 1.440 1.645 1.960 2 2.576 2.807 3 3.291 [10.08, 10.16] [10.09, 10.15] [10.11, 10.13] [10.04, 10.20]