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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.

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