59 Q.#5 A population consists of values 66 57 56 57 60 65 70 62 59 56 71 57 63 75 73 57 75 63 59 55 70 67 62 71 71 70 65 57 70 73 66 57 70 74 75 66 64 60 66 65 61 List all possible systematic samples of sizes 4, 5 and 6 that can be drawn from this population and show that the sample mean is an unbiased estimator of population mean. Compute variance of systematic sampling estimator in each case