Now we will examine the effect of increasing the precision of the study on the sample size. In terms of the MSA, a more precise measurement of b/c would have a smaller standard deviation then a less precise measurement of b/c. This is not as unreasonable as it mean seem at first. Given more practice in the lab and better ongoing quality control, it might be reasonable to expect that the counting of breaks will produce fewer errors in judgment and hence a lower standard deviation. Assume that power is 90%, alpha is 0.05, and the effect size is 0.2 b/c, but then consider the following standard deviations while holding those other factors constant. Enter the required samples sizes below. What trend do you see?

Scenario Three: Measurement Precision Now we will examine the effect of increasing the precision of the study on the sample size. In terms of the MSA, a more precise measm'ement of bfc would have a smaller standard deviation then a less precise measiu'ement of b..-"'c. This is not as unreasonable as it mean seem at rst. Given more practice in the lab and better ongoing quality control, it might be reasonable to expect that the counting of breaks will produce fewer errors in judgment and hence a lower standard deviation. Assrune that power is 90%, alpha is 0.05. and the effect size is 0.2 b..-"'c_. but then consider the following standard deviations while holding those other factors constant. Enter the required samples sizes below. What trend do you see? standard 0.- 0.2 deviation sample size l l l J1 :9 4:. :3 Lu Trend