Kalkulatè gwosè echantiyon
Chwazi yon valè pou chak valè nan lis la.
Rezilta yo mete ajou pandan w ap ekri.
Atik sa a
= 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. The sample size calculator 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. The sample size calculator 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. The sample size calculator 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. The sample size calculator uses the standard formula n = z²·p(1 − p) / e², where z is the critical value for the confidence level. The sample size calculator works with the following examples: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 ≈ 384.16, so you need 385 respondents.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 ≈ 384.16, so you need 385 respondents.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 ≈ 384.16, so you need 385 respondents.Worked example: For a 5% margin at 95% confidence with an unknown proportion (p =
Kesyon ki poze souvan
Ki jan se gwosè echantiyon an kalkile?
Formule baz la se n = z²·p(1 − p) / e², kote z se valè kritik konfiyans, p se pwoporsyon espere ak e se marj erè kòm yon desimal. Rezilta a se arrondi a pi wo paske ou pa ka ankèt yon fraksyon nan yon moun.
Ki sa ki se kòrèkteman fini popilasyon an?
Si popilasyon ou a ti, ou bezwen pi ti kantite repons pase sa fòmil baz la di. Koreksyon n = n₀ / (1 + (n₀ − 1)/N) a redwi kantite moun ki nan echantiyon an pou li rive nan gwosè popilasyon an N. Sa enpòtan anpil lè kantite moun ki nan echantiyon an se yon pati gwo nan tout moun ki nan echantiyon an.
Ki kantite moun mwen bezwen pou yon nivo konfidans 95%?
Sa depann de marj erè ou ka aksepte. Nan konfidans 95% ak yon marj 5% ak pa gen estimasyon anvan ou bezwen sou 385 moun ki reponn; yon marj 3% bezwen sou 1,068 ak yon marj 1% sou 9,604.
Poukisa gwosè echantiyon an ap arrondi?
Ou pa ka sondaj yon pati nan yon moun, se konsa nenpòt rezilta fraksyonèl se arrondi a pi wo a nan enterè ki vini apre. Rondoning pi wo pase pi ba garanti a marge erè pa pi gwo pase ou target.
Eske mwen dwe kite gwosè popilasyon an vid?
Lave li a zewo (oswa vid) lè popilasyon an se trè gwo oswa pa konnen, ki bay "populasyon san limit" gwosè echantiyon. Entre yon popilasyon reyèl sèlman lè li se twò piti pou kòrèkteman diminye echantiyon an.
Ki jan mwen ka diminye gwosè echantiyon an?
Asepte yon marj erè pi gwo, itilize yon nivo konfidans ki pi ba, oswa bay yon pousantaj pi lwen pase 50% si ou gen yon estimasyon ki fiab. Chak de sa ba kantite repons fòmil la mande.
API — itilize sa a calculateur soti nan kòd
Apèl sa a calculateur kòm yon gratis JSON pwent-de-fini - pa gen okenn kle ki nesesè. Envoye valè jaden anba a kòm paramèt kesyonè oswa JSON. Li dokiman API a an antye →
Endpoint
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);Rezilta yo se estimasyon pou kòmandman jeneral sèlman, pa finansye, medikal oswa konsèy taks.