Sample Proportion Calculator
Compute sample proportion p and its standard error from x and n.
Input Data
Input Successes x.
Input Sample n.
Results
0.55
0.049749
p = x/n; SE = √(p(1−p)/n).
At a glance:Sample Proportion Calculator: enter parameters to compute results; complements related calculators.
Formula
p = x / n.
SE = √(p(1−p)/n).
How to Use
- Enter successes x and sample n.
- It returns the proportion and its SE.
Case Studies
x=55, n=100 → p=0.55, SE≈0.04975
SE = √(0.55·0.45/100) ≈ 0.04975.
FAQ
When is the proportion approximately normal?
Typically require np and n(1−p) at least about 5–10.
Related Tools
References
Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.