Sample Size Calculator
Ita shuwa kuti ongororo yako inoratidza kuti bvunzo yacho yakakodzera.
Zvinyorwa zvinogadziridzwa paunenge uchinyora.
Nezve iyi kalkulator
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.
Zvimwe zvinobvunzwa zvakanyanya
Sei muenzaniso urefu waka kalkuled?
Chimwe chezvikonzero ndechekuti n = z²·p(1 − p) / e², apo z ndiyo fungidziro yehuwandu hwevanhu vakaongororwa, p ndiyo fungidziro yehuwandu hwevanhu vakaongororwa uye e ndiyo fungidziro yehuwandu hwevanhu vakaongororwa.
Chii chinonzi finite population correction?
Kana vanhu vako vadiki, iwe unofanira kukumbira zvishoma zvipo kupfuura zvainokurudzira formula yebasa. Kugadzirisa n = n₀ / (1 + (n₀ − 1)/N) kunodzikira mufananidzo kunzvimbo yevanhu N. Izvo zvinokosha zvikuru kana mufananidzo uri mufananidzo mukuru wemufananidzo wose.
Ndezvipi zvikonzero zvandinofanira kuisa 95% confidence level pavanhu vangu?
Izvi zvinobva pamariji ematambudziko aunogona kubvuma. Pa95% confidence nemariji ye5% uye pasina kufungidzira kwakaitwa, iwe unofanirwa kubvunza vanhu vanopfuura 385; mariji ye3% inofanira kubvunza vanhu vanopfuura 1,068 uye mariji ye1% inofanira kubvunza vanhu vanopfuura 9,604.
Nei huwandu hwemufananidzo hwaro hwasvibiswa?
Unogona kuongorora chikamu chemunhu, saka chero chidimbu chemhedzisiro chinorongedzwa kusvika kune chazvino chekumusoro. Kurongedzwa kumusoro kupfuura pasi kunopa chokwadi chekuti marongero ematambudziko haasi akakura kupfuura zvauri kutarisira.
Ndinofanira kuisa mashoko ehuwandu hwevanhu pasi pechivharo here?
Kuisa pazero (kana pasina) kana huwandu hwevanhu hwakakura kana hwasingazivikanwi, izvo zvinopa huwandu hwevanhu hwakafanana nehuwandu hwevanhu vasingaperi. Nzira yekuisa huwandu hwevanhu hwakanaka ndeyekuti huwandu hwevanhu hwakanaka hunofanira kunge huri hudiki zvakakwana kuti kugadzirisa kuite kuti huwandu hwevanhu huve hwakawanda.
Sei ndinogona kuderedza zvinodiwa sample size?
Kubvuma kuwedzera chiyero chekukanganwa, kushandisa yakaderera kuvimbika, kana kupa chikamu pamusoro 50% kana iwe une kuvimbika kufungidzira.Imwe neimwe yezvi zvinodzikira nhamba yezvipo formula zvinoda.
API — kushandisa iyi kalkulator kubva code
Nhare iyi calculator semahara JSON endpoint - hapana chikuru zvinodiwa. Kutumira nzvimbo mavara pasi separameter query kana JSON. Chii zvachose chaunoisa kunze chinoshandisa default iyo peji iri rakasviba nayo; parameter isiri yechokwadi inonzi 400, uye haisi zero. Tora yakazara API docs →
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);Zviratidzo zvemubvunzo ndezvekufungidzira kwechinangwa chekudzidzisa chete, kwete zvemari, zvehutano kana zvemari.