A trainee in a medical lab will be released to work on her own when her results

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A trainee in a medical lab will be released to work on her own when her results agree with those of an experienced worker at the 95% confidence level. Results for a blood urea nitrogen analysis are shown below.
Trainee:x- = 14.57 mg/dls = 0.53mg/dL n = 6 samples
Experienced
Worker:x- = 13.95 mg/dL s = 0.42mg/dL n = 5 samples
(a) What does the abbreviation dL stand for?
(b) Should the trainee be released to work alone?
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