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Appendix 3: 95% Confidence Interval look-up table for childcare workforce estimates
Percentages | Frequencies |
|---|
Percentage reported | Half-width of 95% confidence interval | Number reported | Half-width of 95% confidence interval |
|---|
5 | 0.8 | 1,300 | 200 |
10 | 1.0 | 2,600 | 270 |
15 | 1.2 | 3,900 | 320 |
20 | 1.4 | 5,200 | 360 |
25 | 1.5 | 6,500 | 390 |
30 | 1.6 | 7,800 | 410 |
35 | 1.7 | 9,000 | 430 |
40 | 1.7 | 10,300 | 440 |
45 | 1.7 | 11,600 | 450 |
50 | 1.7 | 12,900 | 450 |
55 | 1.7 | 14,200 | 450 |
60 | 1.7 | 15,500 | 440 |
65 | 1.7 | 16,800 | 430 |
70 | 1.6 | 18,100 | 410 |
75 | 1.5 | 19,400 | 390 |
80 | 1.4 | 20,700 | 360 |
85 | 1.2 | 22,000 | 320 |
90 | 1.0 | 23,300 | 270 |
95 | 0.8 | 24,600 | 190 |
Notes:
See background notes for explanation of confidence intervals.
In this year's figures, the "calibrated sample size" has been used to calculate the confidence intervals. This is necessary because the childminders were selected as a stratified sample and weighted to make the sample representative of the population. In previous years the actual sample size was used, which leads to confidence intervals that are smaller than the correct intervals.
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