Power Calculations – Quiz 6

1. Calculate the total required number of individuals for an impact evaluation with one treatment arm of 200 clusters and one control arm of 200 clusters, an MDES of 0.15 SD, ICC of 0.18, at 5% significance and 80% power. Enter the value here (do not add any other text).

2. Calculate the total required number of individuals for an impact evaluation with one treatment arm and one control arm, randomized at the cluster-level with 10 individuals sampled per cluster, an MDES of 0.15 SD, ICC of 0.18, at 5% significance and 80% power. Enter the value here (do not add any other text).

3. Calculate the power of an impact evaluation with one treatment arm of 80 clusters and one control arm of 80 clusters, 10 individuals per cluster, an MDES of 0.2 SD, an equivalent ICC as within-school correlation of baseline scores in the EG DIB dataset (total_bl), at 5% significance. Round to the nearest 0.01. Enter the value here in the form 0.## (do not add any other text).

4. Repeat question (3), but this time assume that you will control for baseline levels of the outcome variable, and that the correlation between baseline and endline is 0.4. Enter the value here in the form 0.## (do not add any other text).