Understanding a 95% confidence interval for a proportion
- Author:
- PDST PP Maths Team
- Topic:
- Confidence Interval, Probability, Statistics
1. Click on Show Population Proportion to show or hide the population proportion.
2. Type a sample proportion e.g. 0.24 into Single Sample Proportion and press Enter and the sample proportion will be displayed.
3. Repeat Step 2 until you have all the classes sample proportions entered (up to a maximum of 35).
4. Click on Show 95% Confidence Interval to show or hide the 95% confidence intervals for each of the sample proportions.
5. Drag the blue slider to the right to show other sample proportions.
6. Ctrl+R will recompute a different set of sample proportions (but will keep the ones you typed in).
7. Reset will replace the sample proportions you typed in with sample proportions generated by the file.