Three of these towns were large (population between 100,000 and 900,000 inhabitants) and one was medium sized (population between 50,001 and 100,000 inhabitants) [ 20].
Assuming statistical power of (1-β) = .80, type-I error probability of α = .05, and a correlation between covariate and outcome of ρ = .6, a total sample size of N = 84 is required to detect medium sized effects between groups [ 29].
With a sample of 100 participants per group we will be able to observe a medium sized difference between three treatment groups in our primary outcome, caregiver's perceived social support (Social Support Survey, mean 73.3, SD 20.8) (80% power, P < .05 significance) [ 62].
Results also showed convergent validity with a traditional alphabetization self-report measure, and medium sized correlations (.34 .50) between information, formal and strategic skills and measures of Internet use for recreation, information search and occupational purposes.
The majority (10) of studies surveyed had medium sized samples of between 123 and 551, indicating attempts to achieve a representative population.
These choices were according to Mattoon et al. [ 19] that recommended a 7.5 MHz frequency for ultrasound examinations in small dogs and cats, and with Cheida et al. [ 20] that classified the coatis as small to medium sized animals, weighing between 2.7 to 10 kg.
The present study compared the CLBP prevalence in a medium sized city in Brazil between the years 2002 and 2010 and examined factors associated with prevalence in 2010.
Nevertheless, the findings of the criterion validity check show small to medium sized, but significant, correlations between scores on the PCQ-P and the NCSRSQ.
Another high-throughput system, named Sequenom iPLEX Gold genotyping technology provides an ideal technique for medium sized projects, when scoring between 5 and 400 SNP markers on hundreds to a few thousands of DNA samples [ 23].
You need something medium sized (depending on the graphic, somewhere between 30-47 usually works well, but pick and chose yourself).
