1. Sampling results 5 (10%) 74% 10 (20%) 25 (50%) 45 (90%) Sample Size
Actual result
(% green)
Group 1 result (% green and difference)
Group 2 result (% green and difference)
Group 3 result (% green and difference)
Group 4 result (% green and difference) 5
(10%)
74% 10
(20%) 25
(50%) 45
(90%)

2. Confidence intervals calculated via www.raosoft.com
Population
Sample size
(n/%)
Confidence in result 50 5
(10%)
95% +/- 42% 10
(20%)
95% +/- 28% 25
(50%)
95%+/- 14% 45
(90%)
95% +/- 5%

3. 95% +/- 5% sample needed for different populations
Sample size (95% +/-5%)
Percentage sampled 50 45
90%
100 79
79%
200
132
66%
300
168
56%
400
196
49%
500
217
43.4%
1000
278
27.8%
10000
370
3.7%