---
url: "https://questionstar.com/principles-of-survey-research/chapter-4/slide-147.html"
title: "Correcting the Sample Size"
type: "lehrbuch-slide"
chapter: 4
chapterTitle: "Sampling"
slide: 147
---

# Correcting the Sample Size

*Computationally you would need n = 10,000 — with only 100 elements in the population:*

ncorr = n · N n + N − 1

ncorr corrected sample size

n (uncorrected) sample size

N Population size

Example · N = 100

Computationally you would need **n = 10,000** — with only **100** elements in the population:

n ~corr = (10.000 · 100) / (10.000 + 100 − 1) = 1.000.000 / 10.099 ≈ 99

You can't survey more than the entire population — the correction brings the size down to a realistic level.

Calculations show approximate values for a 95% confidence level

---

*Slide 147 of 274 · Chapter 4: Sampling · Principles of Survey Research · Dr. Paul Marx*