Validation & Reliability — question 8 of 10
Write a real answer. It is graded against the question's rubric, and the mastery movement is computed by the same engine the product uses. Scoring here is deterministic rather than model-written, so this page costs nothing to run and nothing is saved. In a track built from your own posting, the same rubric is graded by the model, which is what produces feedback about your reasoning rather than about coverage.
Cpk = min[(USL - mean)/(3σ), (mean - LSL)/(3σ)]
A voltage regulator's output must stay within 3.3V ± 5% for the unit to be considered good (so between 3.135V and 3.465V). Production data across many units shows a mean output of 3.32V with a standard deviation of 0.03V, and the distribution looks normal. Calculate the process capability index (Cpk) for this output, and tell me whether you'd feel comfortable shipping without 100% functional test based on that number.
This one resolves to a number. Give the value in the field below and your reasoning in the box — the number is checked exactly, by arithmetic.