Abstract
A microbiological quality control procedure requiring 9 tubes is described. It is designed so that (1) the probability of rejection exceeds 0·95 when the density of the organisms exceeds a specified critical level, (2) the probability of acceptance exceeds 0·95 when the density of the organisms is less than one‐fifth of this critical level, and (3) estimation of density is adequate over a reasonable range beneath this critical level.
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