Cluster Sample Size Calculation Formula. From the pilot study data we have y t1 166y t2 443y t3 23 m 1 467m 2 483m 3 463 and s c1 346s c2 195s c3 492. Sample size Sample Cluster 20 94554 118 25 60514 76 20 104484 131 25 66870 84 Sample Cluster 20 83018 104 25 53132 66 20 92949 116 25 59487 74 Sample Cluster 20 76529 96 25 48979 61 20 86460 108 25 55334 69 05 06 Prev 187 per 100000 Prev 209 per 100000 k Precision 05 06 k Precision 05 06 k Precision Prev 157 per 100000.
Jun 30 2011 Here n I is the required sample size under individual randomisation k is the available number of clusters ρ is the estimated intra-cluster correlation coefficient and cv represents the coefficient of variation of cluster sizes. 1 1 σ. The American Statistician 55.
A mean score is an average score.
There u will find a topic named allocation of sample sizes to the three stages where formula for optimum allocation for all the sample sizes you have asked for is given. The total sample size required to meet the three accuracy constraints is 930 1014 909 2853 If this sample size is too large for the survey budget quality constraints could be reduced on lower priority strata. Jul 11 2015 E Z 1 α 2 Z 1 β 2 1 θ 2 1 θ 2 1 ˉ n 1 ρ 13 where. You are interested in the average reading level of all the seventh-graders in your city.
