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Classify each QC run: accurate? precise? Which error type?
QC 1
3 trials: 4.9, 5.0, 5.1 g standard: 5.0 g
ANSWER
Accurate + Precise — tight around 5.0; ≈ 0–2% error; random only
QC 2
3 trials: 7.8, 7.8, 7.8 g standard: 5.0 g
ANSWER
Precise, NOT accurate — all 7.8 (tight) but 2.8 g high; 56% error; systematic
QC 3
3 trials: 4.98, 5.02, 5.00 g standard: 5.00 g
ANSWER
Very accurate + precise — ≈ 5.00, spread 0.04; ≈ 0.1–0.4% error; random only
QC 4
3 trials: 6.2, 6.9, 7.5 g standard: 5.0 g
ANSWER
NOT precise, NOT accurate — spread 6.2–7.5, all high; ≈ 20–40% error; random + systematic
QC 5
3 trials: 5.00, 5.00, 5.01 g standard: 5.00 g
ANSWER
Accurate + Precise — ≈ 5.00, tiny spread; <0.1% error; excellent QC
QC 6
3 trials: 4.5, 5.5, 4.6 g standard: 5.0 g
ANSWER
Centered ≈ 5.0 but very spread — NOT precise, roughly accurate; random error large