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Table 2 Margins of error for different percentages and base population sizes and 95% confidence intervals.

From: The 2003 Australian Breast Health Survey: survey design and preliminary results

Size of Base Population

Percentage

 

10

20

30

40

50

3,000

1.3

1.8

2.0

2.2

2.2

2,000

1.6

2.2

2.5

2.7

2.7

1,000

2.3

3.1

3.5

3.8

3.8

500

3.3

4.3

5.0

5.3

5.4

300

4.2

5.6

6.4

6.9

7.0

200

5.1

6.9

7.9

8.4

8.6

100

7.3

9.7

11.1

11.9

12.1