Ononot — In a cluster sampling design, the variance of the sample mea

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In a cluster sampling design, the variance of the sample mean is calculated as $V_{cluster} = V_{SRS} \times Deff$ , where $Deff = 1 + (m-1)\rho$ . If $m = 10$ and $\rho = 0.2$ , what is the design effect ( $Deff$ )?