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A manufacturer quality-checks light bulbs using systematic sampling: every 10th bulb is selected (sampling interval k = 10). Production follows a known pattern—defects occur in clusters due to coolant temperature cycles, with clusters appearing at regular intervals of exactly 10 bulbs. This pattern aligns precisely with the sampling interval. Which problem is most critical?
A manufacturer quality-checks light bulbs using systematic sampling: every 10th bulb is selected (sampling interval k = 10). Production follows a known pattern—defects occur in clusters due to coolant temperature cycles, with clusters appearing at regular intervals of exactly 10 bulbs. This pattern aligns precisely with the sampling interval. Which problem is most critical?