// Numbas version: exam_results_page_options
{"name": "CA2 (2018/19) Substitution 2 (custom feedback)", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"variables": {"a": {"definition": "random(2..6)", "name": "a", "templateType": "anything", "description": "", "group": "Ungrouped variables"}, "b": {"definition": "random(1..8 except a)", "name": "b", "templateType": "anything", "description": "", "group": "Ungrouped variables"}, "c": {"definition": "random(1..9)", "name": "c", "templateType": "anything", "description": "", "group": "Ungrouped variables"}}, "statement": "<p>Find&nbsp;the following indefinite integral&nbsp;using the letter $C$ to represent any unknown constants.</p>", "advice": "<p>integration by Susbtitution</p>", "extensions": [], "preamble": {"css": "", "js": ""}, "variable_groups": [], "functions": {}, "name": "CA2 (2018/19) Substitution 2 (custom feedback)", "variablesTest": {"condition": "", "maxRuns": 100}, "tags": [], "metadata": {"licence": "Creative Commons Attribution 4.0 International", "description": "<p>Integration by susbtitution, no hint given</p>"}, "ungrouped_variables": ["c", "b", "a"], "parts": [{"variableReplacements": [], "vsetRangePoints": 5, "checkVariableNames": false, "showCorrectAnswer": true, "showPreview": true, "expectedVariableNames": [], "checkingType": "absdiff", "scripts": {}, "type": "jme", "prompt": "<p>$\\int\\frac{dx}{\\var{a}x+\\var{b}}$.</p>", "marks": "2", "unitTests": [], "answer": "1/{a}ln({a}x+{b})+C", "showFeedbackIcon": true, "customMarkingAlgorithm": "malrules:\n  [\n    [\"1/{a}ln({a}x+{b})\", \"Almost there! Did you forget to include the integration constant?\"],\n    [\"ln({a}x+{b})\", \"Did  you remember to divide by the number in front of $x$? If you used substitution, double check the relationship between $du$ and $dx$.\"],\n    [\"ln({a}x+{b})+C\", \"Did  you remember to divide by the number in front of $x$? If you used substitution, double check the relationship between $du$ and $dx$.\"],\n    [\"{a}*ln({a}x+{b})\", \"You have multiplied by the number in front of $x$ rather than dividing by it. If you used substitution, double check the relationship between $du$ and $dx$.\"],\n    [\"{a}*ln({a}x+{b})+C\", \"You have multiplied by the number in front of $x$ rather than dividing by it. If you used substitution, double check the relationship between $du$ and $dx$.\"]\n     ]\n\n\nparsed_malrules: \n    map(\n        [\"expr\":parse(x[0]),\"feedback\":x[1]],\n        x,\n        malrules\n    )\n\nagree_malrules (Do the student's answer and the expected answer agree on each of the sets of variable values?):\n    map(\n        len(filter(not x ,x,map(\n            try(\n                resultsEqual(unset(question_definitions,eval(studentexpr,vars)),unset(question_definitions,eval(malrule[\"expr\"],vars)),settings[\"checkingType\"],settings[\"checkingAccuracy\"]),\n                message,\n                false\n            ),\n            vars,\n            vset\n        )))<settings[\"failureRate\"],\n        malrule,\n        parsed_malrules\n    )\n\nmatched_malrules:\n  filter(x[0],x,zip(agree_malrules,parsed_malrules))\n  \nmalrule_feedback:\n    assert(numericallyCorrect,\n        assert(len(matched_malrules)=0,\n            set_credit(0,matched_malrules[0][1][\"feedback\"])\n        )\n    )\n\nmark:\n    apply(studentExpr);\n    apply(unexpectedVariables);\n    apply(numericallyCorrect);\n    apply(malrule_feedback);\n    apply(failMinLength);\n    apply(failMaxLength);\n    apply(forbiddenStringsPenalty);\n    apply(requiredStringsPenalty)", "vsetRange": [0, 1], "extendBaseMarkingAlgorithm": true, "failureRate": 1, "checkingAccuracy": 0.001, "variableReplacementStrategy": "originalfirst"}], "rulesets": {}, "type": "question", "contributors": [{"name": "TEAME UCC", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/351/"}, {"name": "Clodagh Carroll", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/384/"}]}]}], "contributors": [{"name": "TEAME UCC", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/351/"}, {"name": "Clodagh Carroll", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/384/"}]}