Ononot — In a cluster sampling design with K clusters of size M, and

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Data Collectionhard

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In a cluster sampling design with $K$ clusters of size $M$ , and an intra-class correlation coefficient $\rho$ , the design effect is $Deff = 1 + (M-1)\rho$ . If $M=11$ and the design effect is $3$ , what is $\rho$ ?