|
|
|
front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |review |
 |
Example. In a survey of 500 men in a factory, 125 said
that they smoked. The estimate
proportion of
smokers was: 12/500 =0.25 (25%). The standard error from the proportion
of smokers was: SE(p)=√0.25(1-0.25)/500=0.019
95% confidence interval for a proportion is given by:
0.25±1.96 x 0.019 =0.21 a 0.29
|