{"id":616,"date":"2024-06-19T09:09:06","date_gmt":"2024-06-19T06:09:06","guid":{"rendered":"https:\/\/sisu.ut.ee\/measurement\/self-test-9-5\/"},"modified":"2024-06-19T09:09:06","modified_gmt":"2024-06-19T06:09:06","slug":"self-test-9-5","status":"publish","type":"page","link":"https:\/\/sisu.ut.ee\/measurement\/self-test-9-5\/","title":{"rendered":"Self-test 9.5"},"content":{"rendered":"<div id=\"watupro_quiz\" class=\"quiz-area single-page-quiz\">\n<p id=\"submittingExam30\" 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<div class=\"watupro-exam-description\" id=\"description-quiz-30\"><p>Here you can test your understanding of where to obtain data for\u00a0estimating measurement uncertainty contributions of different\u00a0uncertainty sources and how to obtain uncertainty estimates from these data.<\/p>\n<\/div>\n\n<form action=\"\" method=\"post\" class=\"quiz-form\" id=\"quiz-30\" enctype=\"multipart\/form-data\">\n<div class=\"watu-question \" id=\"question-1\" style=\";\"><div id=\"questionWrap-1\" class=\"   watupro-question-id-110\">\n\t\t\t<div class=\"question-content\"><div><span class=\"watupro_num\">1. <\/span>In a liquid chromatographic method determination of tartrazine colorant a sample solution with code SK27 was injected five times during the same day. The injection order was random (i.e. the five samples of SK27 were randomly mixed with other sample solutions and calibration solutions). \u00a0Five chromatograms of SK27 were obtained. The areas of tartrazine peaks on the chromatograms were 1255, 1248, 1262, 1251 and 1257 mAU\u00b7s. Different useful information for measurement uncertainty estimation can be extracted from these data. Which of the following statements are true?<\/div><input type=\"hidden\" name=\"question_id[]\" id=\"qID_1\" value=\"110\" class=\"watupro-question-id\"><input type=\"hidden\" id=\"answerType110\" class=\"answerTypeCnt1\" value=\"checkbox\"><!-- end question-content--><\/div><div class=\"question-choices watupro-choices-columns \" id=\"questionChoices110\"><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-110[]\" id=\"answer-id-356\" class=\"answer   answerof-110 \" value=\"356\"><label for=\"answer-id-356\" id=\"answer-label-356\" class=\" answer\"><span><p>The standard deviation of the mean peak area (i.e. the standard deviation of these 5 values divided by square root of 5) is 2.4 mAU\u00b7s and it takes into account repeatability of the chromatographic determination in the case of sample SK27.<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-110[]\" id=\"answer-id-357\" class=\"answer   answerof-110 \" value=\"357\"><label for=\"answer-id-357\" id=\"answer-label-357\" class=\" answer\"><span><p>The standard deviation of the mean peak area (i.e. the standard deviation of these 5 values divided by square root of 5) is 2.4 mAU\u00b7s and it takes into account possible drift of the detector\u2019s characteristics as well as possible decomposition of the analyte in the sample during the chromatographic determination in the case of sample SK27.<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-110[]\" id=\"answer-id-358\" class=\"answer   answerof-110 \" value=\"358\"><label for=\"answer-id-358\" id=\"answer-label-358\" class=\" answer\"><span><p>The standard deviation of these five values 5.4 mAU\u00b7s can be used to take into account repeatability uncertainty in the case of similar samples for which only one single injection was made.<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-110[]\" id=\"answer-id-359\" class=\"answer   answerof-110 \" value=\"359\"><label for=\"answer-id-359\" id=\"answer-label-359\" class=\" answer\"><span><p>The standard deviation of these five values 5.4 mAU\u00b7s can be used to take into account the uncertainty due to sample preparation.\u00a0<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-110[]\" id=\"answer-id-360\" class=\"answer   answerof-110 \" value=\"360\"><label for=\"answer-id-360\" id=\"answer-label-360\" class=\" answer\"><span><p>The standard deviation of these five values 5.4 mAU\u00b7s can be used to take into account the overall uncertainty due to volumetric operations involved in making the sample solution SK27.\u00a0<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-110[]\" id=\"answer-id-361\" class=\"answer   answerof-110 \" value=\"361\"><label for=\"answer-id-361\" id=\"answer-label-361\" class=\" answer\"><span><p>The standard deviation of the mean peak area (i.e. the standard deviation of these 5 values divided by square root of 5) 2.4 mAU\u00b7s can be used to take into account partial overlap of the analyte peak with an interfering peak on the chromatogram.<\/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-110\" style=\"clear:both;\"><input type=\"button\" id=\"liveResultBtn110\" class=\"liveResultBtn1 watupro-live-result-btn\" value=\"See Answer\" onclick=\"WatuPRO.liveResult(110, 1);\"><\/p>\n\t   <div class=\"watu-question \" id=\"question-2\" style=\";\"><div id=\"questionWrap-2\" class=\"   watupro-question-id-111\">\n\t\t\t<div class=\"question-content\"><div><span class=\"watupro_num\">2. <\/span>An analyst is using a titration procedure of determination of the net content of basic substances in a biological sample. He carried out sample preparation (several extraction steps), obtained 100 ml of a solution and made 5 replicate titrations of 10 ml aliquots (measured by a volumetric pipette) of this solution with HCl solution. He obtained five values and calculated standard deviation of these values. This standard deviation can be used in measurement uncertainty calculation. Which of the following statements\u00a0are correct?<\/div><input type=\"hidden\" name=\"question_id[]\" id=\"qID_2\" value=\"111\" class=\"watupro-question-id\"><input type=\"hidden\" id=\"answerType111\" class=\"answerTypeCnt2\" value=\"checkbox\"><!-- end question-content--><\/div><div class=\"question-choices watupro-choices-columns \" id=\"questionChoices111\"><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-111[]\" id=\"answer-id-362\" class=\"answer   answerof-111 \" value=\"362\"><label for=\"answer-id-362\" id=\"answer-label-362\" class=\" answer\"><span><p>This standard uncertainty takes into account the overall repeatability of all steps of the procedure (sample preparation, pipetting, titration).\u00a0<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-111[]\" id=\"answer-id-363\" class=\"answer   answerof-111 \" value=\"363\"><label for=\"answer-id-363\" id=\"answer-label-363\" class=\" answer\"><span><p>This standard uncertainty takes into account the repeatability of the pipetting and titration steps of the procedure.\u00a0<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-111[]\" id=\"answer-id-364\" class=\"answer   answerof-111 \" value=\"364\"><label for=\"answer-id-364\" id=\"answer-label-364\" class=\" answer\"><span><p>If the indicator is suboptimal and a systematic over-titration occurs as a result then this standard deviation does not take it into account.\u00a0<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-111[]\" id=\"answer-id-365\" class=\"answer   answerof-111 \" value=\"365\"><label for=\"answer-id-365\" id=\"answer-label-365\" class=\" answer\"><span><p>If the organic bases that cause basicity are sensitive compounds and partially decompose during sample preparation, preparation of solution or during titration then this standard uncertainty takes this decomposition into account.\u00a0<\/p><\/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-111\" style=\"clear:both;\"><input type=\"button\" id=\"liveResultBtn111\" class=\"liveResultBtn2 watupro-live-result-btn\" value=\"See Answer\" onclick=\"WatuPRO.liveResult(111, 2);\"><\/p>\n\t   <div style=\"display:none\" id=\"question-3\">\n\t<div class=\"question-content\">\n\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<\/div>\n<\/div>\n\n<br>\n\t\n\t\t\t<div class=\"watupro_buttons flex \" id=\"watuPROButtons30\">\n\t\t  <div id=\"prev-question\" style=\"display:none;\"><input type=\"button\" value=\"&lt; 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