3. 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=14.57mg/dLs=0.53mg/dLn=6 samples Experienced worker: x=13.9smg/dLs=0.42mg/dLn=5 samples (a) What does the abbreviation dL stand for? ( 1 point) (b) Should the trainee be released to work alone? ( 4 points)