// Numbas version: finer_feedback_settings
{"name": "Infection and Disease Case study Immunoassay", "extensions": [], "custom_part_types": [], "resources": [["question-resources/Graph.png", "Graph_x1PUgAk.png"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "Infection and Disease Case study Immunoassay", "tags": [], "metadata": {"description": "", "licence": "None specified"}, "statement": "<p>Determination of LD's serum CEA concentrations from the absorbance data and calibration curve.</p>", "advice": "", "rulesets": {}, "extensions": [], "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true, "j": false}, "constants": [], "variables": {"m": {"name": "m", "group": "Ungrouped variables", "definition": "random(0.089 .. 0.157#0.0001)", "description": "<p>slope</p>", "templateType": "randrange", "can_override": false}, "cv": {"name": "cv", "group": "Ungrouped variables", "definition": "random(-0.1146 .. 0.1146#0.0001)", "description": "<p>Randomisation in relationship between slope and intercept</p>", "templateType": "randrange", "can_override": false}, "Serum_A": {"name": "Serum_A", "group": "Ungrouped variables", "definition": "random(15.01 .. 20.99#0.01)", "description": "<p>Serum A CEA</p>", "templateType": "randrange", "can_override": false}, "Serum_B": {"name": "Serum_B", "group": "Ungrouped variables", "definition": "random(0.55 .. 0.85#0.001)", "description": "<p>Serum B CEA</p>", "templateType": "randrange", "can_override": false}, "Serum_C": {"name": "Serum_C", "group": "Ungrouped variables", "definition": "random(2.01 .. 2.99#0.01)", "description": "<p>Serum C CEA</p>", "templateType": "randrange", "can_override": false}, "Serum_abs_A": {"name": "Serum_abs_A", "group": "Ungrouped variables", "definition": "trunc(((m*(ln(Serum_A)))+c), 3)\n", "description": "", "templateType": "anything", "can_override": true}, "c": {"name": "c", "group": "Ungrouped variables", "definition": "trunc(((m*1.7367) + (0.0548 + cv)), 4)", "description": "", "templateType": "anything", "can_override": false}, "TestA": {"name": "TestA", "group": "Ungrouped variables", "definition": "trunc((exp((Serum_abs_A-c)/m)), 2)\n", "description": "", "templateType": "anything", "can_override": false}, "Serum_abs_B": {"name": "Serum_abs_B", "group": "Ungrouped variables", "definition": "trunc(((m*(ln(Serum_B)))+c), 3)", "description": "", "templateType": "anything", "can_override": false}, "Serum_abs_C": {"name": "Serum_abs_C", "group": "Ungrouped variables", "definition": "trunc(((m*(ln(Serum_C)))+c), 3)", "description": "", "templateType": "anything", "can_override": false}, "TestB": {"name": "TestB", "group": "Ungrouped variables", "definition": "trunc((exp((Serum_abs_B-c)/m)), 4)", "description": "", "templateType": "anything", "can_override": false}, "TestC": {"name": "TestC", "group": "Ungrouped variables", "definition": "trunc((exp((Serum_abs_C-c)/m)), 3)", "description": "", "templateType": "anything", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["m", "cv", "c", "Serum_A", "Serum_B", "Serum_C", "Serum_abs_A", "Serum_abs_B", "Serum_abs_C", "TestA", "TestB", "TestC"], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "information", "useCustomName": true, "customName": "Background", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>In your immunoassay practical, you performed an immunoassay on LD's serum samples and prepared a calibration curve from your laboratory data of CEA concentration versus absorbance similar to the image below. From this, you generated a calibration curve and calculated the slope (m) and intercept (b). You then used these values to calculate the CEA concentrations of LD's serum samples.</p>\n<p><strong>Please refer to pages 40 to 42 of your Term 1 Practical Handbook, as well as the additional guidance materials and the 'Immunoassay NUMBAS calculation video' in the Week 14 folder.</strong></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><img src=\"resources/question-resources/Graph.png\" width=\"828\" height=\"498\"/></p>"}, {"type": "information", "useCustomName": true, "customName": "Question", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>A new experiment has been performed.&nbsp;From this, you have determined that the slope (m) is {m} and the intercept (b) is {c}.</p>\n<p>You have determined that the equation of the line for your calibration is y = {m} . ln(x) + {c}</p>\n<p>Please calculate the CEA levels for Serum samples A, B and C from the absorbance values as follows:</p>\n<p></p>\n<p><strong>PLEASE ENSURE THAT YOU USE AT LEAST 3 DECIMAL PLACES WHEN CONVERTING LN(X) TO Exp(X).</strong></p>"}, {"type": "numberentry", "useCustomName": true, "customName": "Serum A", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Serum A absorbance of {Serum_abs_A}, calculate the CEA concentration of Serum A</p>", "minValue": "{TestA}*0.99", "maxValue": "{TestA}*1.01", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "displayAnswer": "", "precisionType": "sigfig", "precision": "3", "precisionPartialCredit": "100", "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": false, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": true, "customName": "Serum B", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Serum B absorbance of {Serum_abs_B}, calculate the CEA concentration of Serum B</p>", "minValue": "{TestB}*0.99", "maxValue": "{TestB}*1.01", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "displayAnswer": "", "precisionType": "sigfig", "precision": "3", "precisionPartialCredit": "100", "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": false, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": true, "customName": "Serum C", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], 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