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This assumption leads to the highest sample size with a precision of 1.9%.
According to the sample size calculator by Raosoft [29], the minimum sample size is equal to 372 (margin of error: 5 %; confidence level: 95%%; response distribution for the highest sample size: 50%%).
The highest sample size of 1,621 students was reported for a study conducted by Roschelle et al. (2010), and the lowest sample size of 12 participants was reported by Lai and White (2012).
This assumption led to the highest sample size with precision.
The second cluster had the highest sample size (n=100, 47%).
For this calculation, the variance that gives the highest sample size i.e. 3 was taken from the above study.
Similar(47)
Top: all population samples; bottom: after removing the two samples with highest sample sizes (82 and 280 individuals, respectively).
In the first analysis, sample sizes were highly unevenly distributed across sites so that results would be biased toward those sites with the highest sample sizes.
To our knowledge this is one of the highest sample sizes of any costing study conducted in developing countries, and this coupled with the depth of data collection, renders the Kenyan costing study the most comprehensive of its kind.
Both reports vary wildly in their estimates of people participating in each activity, so I'm going to use the ABS survey which, although it doesn't survey beachgoers specifically, has a higher sample size and far less year-to-year variation.
For this purpose well-designed multicenter studies are desirable to achieve a high sample size.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com