{"id":1011877,"date":"2019-09-10T02:00:01","date_gmt":"2019-09-10T09:00:01","guid":{"rendered":"https:\/\/qa-release.questionpro.com\/blog\/o-que-e-a-amostragem-aleatoria\/"},"modified":"2025-02-19T09:10:39","modified_gmt":"2025-02-19T16:10:39","slug":"o-que-e-a-amostragem-aleatoria","status":"publish","type":"post","link":"https:\/\/qa-release.questionpro.com\/blog\/pt\/o-que-e-a-amostragem-aleatoria\/","title":{"rendered":"O que \u00e9 a amostragem aleat\u00f3ria?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">A amostragem aleat\u00f3ria \u00e9 um tipo de amostragem f\u00e1cil de efetuar. Consiste em enumerar os elementos da popula\u00e7\u00e3o e selecionar aleatoriamente os elementos que constituir\u00e3o a amostra. \u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Neste tipo de <\/span><span style=\"font-weight: 400;\">amostragem probabil\u00edstica<\/span><span style=\"font-weight: 400;\"> cada elemento da popula\u00e7\u00e3o tem a mesma probabilidade de ser selecionado.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Tipos de amostragem aleat\u00f3ria<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A amostragem aleat\u00f3ria pode ser efectuada de diferentes formas. Entre as principais, podes citar as seguintes: \u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><b>Amostragem aleat\u00f3ria simples<\/b><b>:<\/b><span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"> Um processo em que todos os membros do p\u00fablico-alvo e todas as amostras poss\u00edveis t\u00eam a mesma probabilidade de serem escolhidos.<\/span><\/span>\u00a0<\/li>\n<li style=\"font-weight: 400;\"><b>Amostragem estratificada:<\/b> <span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Este tipo de amostragem visa separar o p\u00fablico-alvo em segmentos exclusivos e homog\u00e9neos. Posteriormente, procede-se a uma amostragem aleat\u00f3ria simples em cada estrato. <\/span><\/span>\u00a0<\/li>\n<li style=\"font-weight: 400;\"><b>Amostragem de grupos<\/b><b>: <\/b> <span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Neste procedimento, os elementos do p\u00fablico-alvo s\u00e3o naturalmente escolhidos de forma aleat\u00f3ria por agrupamentos. S\u00e3o selecionados individualmente. <\/span><\/span>\u00a0<\/li>\n<li style=\"font-weight: 400;\"><b>Amostragem sistem\u00e1tica:<\/b> <span style=\"font-weight: 400;\">Neste tipo de amostragem aleat\u00f3ria, \u00e9 feita uma sele\u00e7\u00e3o aleat\u00f3ria do primeiro elemento da amostra, sendo depois escolhidos os restantes, atrav\u00e9s de intervalos fixos ou sistem\u00e1ticos, at\u00e9 se obter a dimens\u00e3o da amostra pretendida.\u00a0<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">Orienta\u00e7\u00f5es para a realiza\u00e7\u00e3o de uma amostra aleat\u00f3ria<\/span><\/h2>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">A primeira etapa da amostragem aleat\u00f3ria consiste em selecionar a popula\u00e7\u00e3o-alvo.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Em seguida, identifica a base de amostragem para a tua popula\u00e7\u00e3o-alvo.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Avalia a base de amostragem e faz os ajustamentos necess\u00e1rios.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Atribui um n\u00famero \u00fanico a cada elemento do p\u00fablico-alvo.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Define o <\/span><span style=\"font-weight: 400;\">tamanho da amostra<\/span><span style=\"font-weight: 400;\">.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Seleciona aleatoriamente o n\u00famero espec\u00edfico de elementos da popula\u00e7\u00e3o.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">Vantagens da amostragem aleat\u00f3ria<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">As principais vantagens da amostragem aleat\u00f3ria s\u00e3o as seguintes:\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Ao contr\u00e1rio de outros m\u00e9todos, se for feito corretamente, reduz qualquer preconceito.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">\u00c9 muito f\u00e1cil selecionar uma amostra pequena de uma popula\u00e7\u00e3o maior.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">N\u00e3o \u00e9 necess\u00e1rio ser um especialista e ter conhecimentos t\u00e9cnicos para realizar este processo, basta fazer uma pergunta para recolher as informa\u00e7\u00f5es necess\u00e1rias.\u00a0<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">Desvantagens da amostragem aleat\u00f3ria\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Algumas desvantagens da amostragem aleat\u00f3ria s\u00e3o:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Pode ser um m\u00e9todo de recolha de dados muito dispendioso.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">N\u00e3o deve ser efectuada em estudos para os quais s\u00e3o necess\u00e1rias entrevistas pessoais.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">\u00c9 dif\u00edcil de realizar quando a dimens\u00e3o da amostra \u00e9 muito grande.\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Se queres realizar uma investiga\u00e7\u00e3o que requer pouco tempo e dinheiro, a amostragem aleat\u00f3ria \u00e9 a melhor op\u00e7\u00e3o para ti. \u00c9 certamente muito pr\u00e1tica.\u00a0\u00a0<\/span><\/p>\n<p>\u00a0<\/p>\n\n\n<br>\n<center>\n<a href=\"https:\/\/eu.questionpro.com\/a\/showEntry.do?lan=pt_PT&#038;custom1=blog\">\n        <button style=\"background: #ff9f00\">Cria uma conta gratuita<\/button>\n    <\/a>\n    <a href=\"https:\/\/contactar.questionpro.com\/t\/AM4X9Z3LxD?custom1=amostragem-aleat\u00f3ria\u201d target=\"_blank\" rel=\"noopener\">\n        <button>Agendar uma demonstra\u00e7\u00e3o<\/button>\n    <\/a>\n<\/center>\n<br>\n","protected":false},"excerpt":{"rendered":"<p>A amostragem aleat\u00f3ria \u00e9 um tipo de amostragem f\u00e1cil de efetuar. Consiste em enumerar os elementos da popula\u00e7\u00e3o e selecionar [&hellip;]<\/p>\n","protected":false},"author":42,"featured_media":938971,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"amostragem aleat\u00f3ria","_yoast_wpseo_title":"O que \u00e9 a amostragem aleat\u00f3ria?","_yoast_wpseo_metadesc":"Aprende o que \u00e9 a amostragem aleat\u00f3ria, as vantagens e desvantagens da amostragem aleat\u00f3ria e um guia para uma amostragem aleat\u00f3ria bem sucedida.","_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[2140],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 a amostragem 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