{"id":1172,"date":"2024-04-11T14:34:15","date_gmt":"2024-04-11T11:34:15","guid":{"rendered":"https:\/\/sisu.ut.ee\/lcms_method_validation\/self-test-6-1\/"},"modified":"2024-04-11T14:34:15","modified_gmt":"2024-04-11T11:34:15","slug":"self-test-6-1","status":"publish","type":"page","link":"https:\/\/sisu.ut.ee\/lcms_method_validation\/self-test-6-1\/","title":{"rendered":"Self test 6.1"},"content":{"rendered":"<div id=\"watupro_quiz\" class=\"quiz-area single-page-quiz\">\n<p id=\"submittingExam5\" style=\"display:none;text-align:center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sisu.ut.ee\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\"><\/p>\n\n\n\n<form action=\"\" method=\"post\" class=\"quiz-form\" id=\"quiz-5\" enctype=\"multipart\/form-data\">\n<div class=\"watu-question \" id=\"question-1\" style=\";\"><div id=\"questionWrap-1\" class=\"   watupro-question-id-19\">\n\t\t\t<div class=\"question-content\"><div><span class=\"watupro_num\">1. <\/span>An analyst intended to determine the repeatability of the method. He analyzed a food sample with LC-MS. He carefully homogenized the sample in a blender and took a subsample. With the subsample he carried out sample preparation (consisting of extraction, precipitation and centrifugation). As a result he obtained a clear solution. He transferred it into a 100 ml volumetric flask and filled it up to the mark with the mobile phase. He analyzed 10 aliquots of this solution during the same day and calculated the repeatability as standard deviation of the results.<br>\r\n<br>\r\n<strong>Question: What did he actually determine?<\/strong><\/div><input type=\"hidden\" name=\"question_id[]\" id=\"qID_1\" value=\"19\" class=\"watupro-question-id\"><input type=\"hidden\" id=\"answerType19\" class=\"answerTypeCnt1\" value=\"checkbox\"><!-- end question-content--><\/div><div class=\"question-choices watupro-choices-columns \" id=\"questionChoices19\"><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-19[]\" id=\"answer-id-65\" class=\"answer   answerof-19 \" value=\"65\"><label for=\"answer-id-65\" id=\"answer-label-65\" class=\" answer\"><span><p>Repeatability of the method\u00a0<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-19[]\" id=\"answer-id-67\" class=\"answer   answerof-19 \" value=\"67\"><label for=\"answer-id-67\" id=\"answer-label-67\" class=\" answer\"><span><p>Repeatability of sample preparation\u00a0<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-19[]\" id=\"answer-id-64\" class=\"answer   answerof-19 \" value=\"64\"><label for=\"answer-id-64\" id=\"answer-label-64\" class=\" answer\"><span><p>Within-lab reproducibility of the method\u00a0<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-19[]\" id=\"answer-id-63\" class=\"answer   answerof-19 \" value=\"63\"><label for=\"answer-id-63\" id=\"answer-label-63\" class=\" answer\"><span><p>Bias<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-19[]\" id=\"answer-id-66\" class=\"answer   answerof-19 \" value=\"66\"><label for=\"answer-id-66\" id=\"answer-label-66\" class=\" answer\"><span><p>Repeatability of the analysis step of the method\u00a0<\/p><\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div>\t\t\t\t\t<div style=\"display:none;\" id=\"liveResult-1\">\t\t   \n\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sisu.ut.ee\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\" alt=\"Loading...\" title=\"Loading...\">\u00a0Loading...\t\t\t\t\t<\/div>\t\n\t\t\t<\/div> \n\t   \t<p id=\"liveResBtn-19\" style=\"clear:both;\"><input type=\"button\" id=\"liveResultBtn19\" class=\"liveResultBtn1 watupro-live-result-btn\" value=\"See Answer\" onclick=\"WatuPRO.liveResult(19, 1);\"><\/p>\n\t   <div class=\"watu-question \" id=\"question-2\" style=\";\"><div id=\"questionWrap-2\" class=\"   watupro-question-id-20\">\n\t\t\t<div class=\"question-content\"><div><span class=\"watupro_num\">2. <\/span>It is recommended to order a CRM to determine the precision of a method.<\/div><input type=\"hidden\" name=\"question_id[]\" id=\"qID_2\" value=\"20\" class=\"watupro-question-id\"><input type=\"hidden\" id=\"answerType20\" class=\"answerTypeCnt2\" value=\"radio\"><!-- end question-content--><\/div><div class=\"question-choices watupro-choices-columns \" id=\"questionChoices20\"><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"radio\" name=\"answer-20[]\" id=\"answer-id-68\" class=\"answer   answerof-20 \" value=\"68\"><label for=\"answer-id-68\" id=\"answer-label-68\" class=\" answer\"><span>True<\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"radio\" name=\"answer-20[]\" id=\"answer-id-69\" class=\"answer   answerof-20 \" value=\"69\"><label for=\"answer-id-69\" id=\"answer-label-69\" class=\" answer\"><span>False<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div>\t\t\t\t\t<div style=\"display:none;\" id=\"liveResult-2\">\t\t   \n\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sisu.ut.ee\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\" alt=\"Loading...\" title=\"Loading...\">\u00a0Loading...\t\t\t\t\t<\/div>\t\n\t\t\t<\/div> \n\t   \t<p id=\"liveResBtn-20\" style=\"clear:both;\"><input type=\"button\" id=\"liveResultBtn20\" class=\"liveResultBtn2 watupro-live-result-btn\" value=\"See Answer\" onclick=\"WatuPRO.liveResult(20, 2);\"><\/p>\n\t   <div class=\"watu-question \" id=\"question-3\" style=\";\"><div id=\"questionWrap-3\" class=\"   watupro-question-id-21\">\n\t\t\t<div class=\"question-content\"><div><span class=\"watupro_num\">3. <\/span>The precision should be evaluated before the trueness.<\/div><input type=\"hidden\" name=\"question_id[]\" id=\"qID_3\" value=\"21\" class=\"watupro-question-id\"><input type=\"hidden\" id=\"answerType21\" class=\"answerTypeCnt3\" value=\"radio\"><!-- end question-content--><\/div><div class=\"question-choices watupro-choices-columns \" id=\"questionChoices21\"><div 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