The following results were obtained for the determination of sulfur in a coal sample. The average for 4 trials was 1.94 %S with a standard deviation of 0.04 %S. Based on these data, report the 95% confidence limits for the average sulfur content.
Report your answer as a simple decimal number equal to one half of the overall confidence interval. For example, if the C.I. =0.20 %S, report 0.20.