You have 5 minutes until the end of the exam.
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", "action": "warn"}}, "question_groups": [{"pickQuestions": 1, "name": "Statistics", "pickingStrategy": "all-shuffled", "questions": [{"name": "Populations and Samples", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Hemali Patel", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/1910/"}], "advice": "", "tags": [], "preamble": {"js": "", "css": ""}, "rulesets": {}, "variablesTest": {"maxRuns": 100, "condition": ""}, "variables": {}, "functions": {}, "statement": "Define the following statistical terms.
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\n[[0]]
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", "advice": "To find the mean of a set numbers, add all the numbers together and divide by how many values there are.
\nThe midpoint of a data set is the first value and the last value divided by each other.
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\n{x1},{x2},{x3},{x4},{x5},{x6}, {x7},{x8},{x9},{x10}
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", "mustBeReduced": false, "precisionPartialCredit": 0, "showPrecisionHint": true, "marks": 1, "minValue": "sqrt((variance2)-(mean2))", "strictPrecision": true, "showFeedbackIcon": true, "type": "numberentry", "correctAnswerFraction": false, "maxValue": "sqrt((variance2)-(mean2))", "scripts": {}, "precisionMessage": "You have not given your answer to the correct precision.", "precision": "2", "allowFractions": false, "showCorrectAnswer": true, "precisionType": "dp", "variableReplacements": [], "notationStyles": ["plain", "en", "si-en"]}], "metadata": {"description": "", "licence": "None specified"}, "variable_groups": [], "variables": {"x1": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x1"}, "x6": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x6"}, "x7": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x7"}, "x9": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x9"}, "mean1": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "({x1}+{x2}+{x3}+{x4}+{x5}+{x6}+{x7}+{x8}+{x9}+{x10}+{x11}+{x12})/12", "name": "mean1"}, "x8": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x8"}, "x10": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x10"}, "variance1": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "{x1}^2+{x2}^2+{x3}^2+{x4}^2+{x5}^2+{x6}^2+{x7}^2+{x8}^2+{x9}^2+{x10}^2+{x11}^2+{x12}^2", "name": "variance1"}, "x12": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x12"}, "x11": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x11"}, "variance2": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "(variance1)/12", "name": "variance2"}, "x4": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x4"}, "x2": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x2"}, "x5": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x5"}, "mean2": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "{mean1}^2", "name": "mean2"}, "x3": {"group": "Ungrouped variables", "templateType": "anything", "description": "", "definition": "random(0..100)", "name": "x3"}}, "advice": "The variance is defined by the following formula:
\nSum of x^2/no. of data points - (mean)^2
\nThe standard deviation is the square root of the variance.
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\n{x1},{x2},{x3},{x4},{x5},{x6}, {x7},{x8},{x9},{x10}, {x11}, {x12}
", "rulesets": {}, "type": "question"}]}], "feedback": {"showanswerstate": true, "feedbackmessages": [{"message": "Well done! You have scored atleast 70%. The main advice I can give you is to keep revising and concentrate on your own areas of weakness where you deem fit!
", "threshold": "70"}], "intro": "Welcome to the Statistics Exam. Here you will be answering different types of questions that cover this broad topic. Please do these questions on your own in silence. Good Luck!
", "allowrevealanswer": false, "showactualmark": true, "showtotalmark": true, "advicethreshold": 0}, "percentPass": 0, "navigation": {"browse": true, "showresultspage": "oncompletion", "preventleave": false, "showfrontpage": true, "reverse": true, "allowregen": false, "onleave": {"message": "", "action": "none"}}, "name": "Statistics", "metadata": {"licence": "None specified", "description": "These questions are designed to give students on questions to do with statistics. They are basic but gives a small understanding on mean, variance and standard deviation. There are also some definitions.
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