I-Calculator yesayizi yesampula
Thola ubukhulu besampula ye-survey ye-target margin of error.
Iziphetho zivuselelwa uma ubhala.
Malunga nale khadi
example, if you are surveying a small group of people, you need to survey 100 respondents. 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. If you are surveying a large group of people, you need to survey 100 respondents. 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. If you are surveying a large group of people, you need to survey 100 respondents. 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 100 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 100 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.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 ≈ 384.1
Imibuzo ebuzwa kaningi
Ubukhulu besampula bucalwa kanjani?
Ifomula eyinhloko yi n = z²·p(1 − p) / e², lapho z kuyinto ebalulekile yobuhlakani, p isilinganiso esilindelekile futhi e ibanga lephutha njengezinga leshumi. Imiphumela iqoqwe phezulu ngoba awukwazi ukubheka inhlamvu yomntu.
Yini iphutha lomphakathi ophele?
Uma inani lakho lincane, udinga iziphenduli ezincane kunale fomula eyinhloko ephakamisa. Ukuxazulula n = n₀ / (1 + (n₀ − 1)/N) kuncane isampula ebheke ubukhulu beqembu N. Kubalulekile kakhulu uma isampula iyisiqephu esikhulu sengxenye egcwele.
Ingabe abantu abaningi ngifuna ukuqinisekisa i-95%?
Kuxhomekeka kunoma yikuphi ukufinyelela kwephutha ongakwenzi. Ku-95% uqiniseko nge-5% ukufinyelela futhi akukho ukulinganiselwa okungaphambili odinga mayelana 385 abaphenduli; 3% ukufinyelela odinga mayelana 1,068 no-1% ukufinyelela mayelana 9,604.
Kungani isilinganisi sincane?
Awukwazi ukubheka ingxenye yomuntu, ngakho noma yisiphi isiphetho esihlukanisiwe sizojikelezwa phezulu kuye kunombolo elandelayo egcwele. Ukujikeleza phezulu ngaphezu kokuphansi kuqinisekise ukuthi ibanga lephutha alikhulu kunalokho ofuna ukukwenza.
Ingabe kufanele ngishiye ubukhulu beqembu eliphilayo olungasebenzi?
Uzoshiya ku zero (noma ungenalo) uma inani lomphakathi likhulu kakhulu noma aliziwa, elinikeza ubukhulu besampula olujwayelekile "lomphakathi ongenalutho". Faka inani lomphakathi olusemthethweni kuphela uma lincane ngokwanele ukuthi ukulungisa kuncane kakhulu isampula.
Ngingayinciphisa kanjani isampula edingekayo?
Yamkela ibanga elikhulu lephutha, sebenzisa izinga eliphansi lokuzithemba, noma nikeza inhlanganisela engaphezulu kwe-50% uma unesibalo esithembekile. Yonke le misebenzi ikhuphula inani lemiphumela efuna ifomula.
API — sebenzisa le calculator kusuka kukhodi
Nquma le kalkuli njengendawo ephelezelwa i-JSON - akukho isitshixo esidingekayo. Thumela amaxabiso endawo ngezansi njengepharamitha yombuzo noma i-JSON. Funda i-API egcwele →
Ingxenye yendawo
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);Izibalo ziyisilinganiso esisetshenziswa ukuqondisa kuphela, hhayi ukucebisa ngezimali, ukwelashwa noma ukukhokha.