Àwọn

Wá àwọn ìwọ̀n àwọn ààyè-iṣẹ́ ìṣàmúlò-ètò fún àwọn ìṣàmúlò-ètò àìfàmúlò-ètò.

Àwọn Ìjánu-ìṣàmúlò-ètò

Àwọn àwọn ìṣàmúlò-ètò

Àwọn ìṣàmúlò-ètò ?

Expected result split. 50% is the most conservative.

Ìwọ̀n àwọn àwọn ìṣàmúlò-ètò ?

Àwọn àwọn ìṣàmúlò-ètò. Fi 0 pamọ́ fún àwọn àwọn ìṣàmúlò-ètò nla/ kò mọ̀.

Ìwọ̀n àwọn ìṣàmúlò-ètò —

Àwọn àwọn àgbéwọlé —

Àwọn Àtòjọ-ẹ̀yàn àwọn ìṣàmúlò-ètò

Ńlà àwọn àwọn ààtò àtòjọ-ẹ̀yàn yìí?

Àkóónú ìṣàmúlò-ètò yìí

This sample size calculator finds how many people you need to survey for a chosen margin of error and confidence level — the planning step before you run a poll or study. It uses the standard formula n = z²·p(1 − p) / e², where z is the critical value for the confidence level, p the expected proportion and e the target margin of error as a decimal.

When you supply a total population size it also applies a finite-population correction, n = n₀ / (1 + (n₀ − 1)/N), which lowers the required sample when you are surveying a large fraction of a small group. A table shows the sample needed at several common margins of error, and the result is always rounded up because you cannot survey a fraction of a person.

Worked example: for a 5% margin at 95% confidence with an unknown proportion (p = 0.5), n = 1.96² × 0.5 × 0.5 ÷ 0.05² = 3.8416 × 0.25 ÷ 0.0025 ≈ 384.16, so you need 385 respondents. Tightening the margin to 3% pushes that to about 1,068. The default 50% proportion gives the largest, safest sample; entering a better estimate of the true proportion reduces it.

Àwọn Àtòjọ-ẹ̀yàn

Bawo ní a ṣe lè ṣé ìṣàmúlò-ètò ìṣàmúlò-ètò?

The base formula is n = z²·p(1 − p) / e², where z is the confidence critical value, p the expected proportion and e the margin of error as a decimal. The result is rounded up because you cannot survey a fraction of a person.

Kini ìṣàmúlò-ètò ìṣàmúlò-ètò?

Tí àwọn eniyan rẹ bá jẹ́ kéré, ò ní àwọn àwọn àgbékalẹ̀ tí o fẹ́ jú tí àwọn fómúlì ìṣàmúlò-ètò bá jẹ́. Àwọn ìṣàmúlò-ètò n = n₀ / (1 + (n₀ − 1)/N) tí wọ́n fi àwọn ààyè pamọ́ sí ìwọ̀n àwọn eniyan N. Ò jẹ́ ohun tí o yẹ̀ jú gbogbo nígbà tí àwọn ààyè jẹ́ àwọn à

Ìgbà wò ní mò fẹ́ fun àwọn eniyan 95% tí mò fẹ́?

O da lori igun ti aṣiṣe ti o le gba. Ni 95% igbẹkẹle pẹlu igun 5% ati ko si iwadi ti o ti wa ni ti o nilo nipa 385 awọn alabapin; a igun 3% nilo nipa 1,068 ati a igun 1% nipa 9,604.

Kini idi ti àwọn ìwọ̀n ààyè-iṣẹ́ náà tí a fi pẹ̀lú?

You cannot survey part of a person, so any fractional result is rounded up to the next whole number. Rounding up rather than down guarantees the margin of error is no larger than your target.

Ńbí mò fi àwọn ìwọ̀n àwọn ìṣàmúlò-ètò pamọ́?

Fi o kù ní pàtó nípa ìwọ̀n (tabí àwọ́fẹ́) tí àwọn ìsàlẹ̀-ilà bá jẹ́ nlà jù àwọn àwọn ìsàlẹ̀-ilà lọ́wọ́lọ́wọ́ lọ́wọ́lọ́wọ́, tí a fi "àwọn ìsàlẹ̀-ilà tí kò ní ìgbà ìparí" àwọn ìsàlẹ̀-ilà ìṣàmúlò-ilà. Fi àwọn ìsàlẹ̀-ilà òótọ́ pamọ́ nígbà tí o bá jẹ́ kékeré jú àwọn ìsàlẹ̀-ilà lọ́wọ́lọ́wọ́.

Bawo ni mo ti lè fi ìgbàdúrò ìwọ̀n ààyè-iṣẹ́ náà?

Accept a larger margin of error, use a lower confidence level, or supply a proportion further from 50% if you have a reliable estimate. Each of these lowers the number of responses the formula demands.

API — ló àwọn ìṣàmúlò-ètò yìí láti inú ìṣàmúlò-ètò

Fi àwọn ìṣàmúlò-ètò yìí kọ̀ǹpútà yìí láti jẹ́ ààyè-iṣẹ́ JSON tí a tí fi pamọ́ - kò ní bọ́tìnì kan tí a fẹ́. Fi àwọn fálù ààyè-iṣẹ́ sílẹ̀ sí bí àwọn àwọn ìṣàmúlò-ètò àti JSON. Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. Ka àwọn àkọlé API kíkún →

Àwọn Ààyè Ìjánu-ìṣàmúlò-ètò

GET https://calculator.free/api/v1/sample-size/

curl

curl "https://calculator.free/api/v1/sample-size/?conf=1.96&e=5"

JavaScript `fetch()`

const r = await fetch(
  "https://calculator.free/api/v1/sample-size/?" + new URLSearchParams({
    "conf": "1.96",
    "e": "5"
  }));
const data = await r.json();
console.log(data.results);

Results are estimates for general guidance only, not financial, medical or tax advice.

Àkóónú ìṣàmúlò-ètò yìí

Àwọn Àtòjọ-ẹ̀yàn

Àwọn Ìṣàmúlò-ètò Ìṣàmúlò-ètò

Àwọn Ààyè Ìjánu-ìṣàmúlò-ètò

curl

JavaScript fetch()

JavaScript `fetch()`