Ononot — In a cluster sample, the variance of the mean is V(\bar{y}{c

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In a cluster sample, the variance of the mean is $V(\bar{y}_{cl}) = V_{SRS} \cdot [1 + (m-1)\rho]$ . If $m=10$ and the design effect $Deff = 2.8$ , what is the intra-class correlation coefficient $\rho$ ?