How to calculate confidence intervals for multinomial proportions?
I have the following data:20%
30%
40%
10%Let's say for the type of a some product: a. b, c, d (respectively)
How to calculate confidence intervals for each proportion?P.S. In this imitation example, we consider (for simplicity) that absolute numbers are also: 20, 30, 40 and 10 (total number: 100)