// Numbas version: finer_feedback_settings {"name": "Correlation and regression quiz", "metadata": {"description": "", "licence": "None specified"}, "duration": 1200, "percentPass": 0, "showQuestionGroupNames": false, "showstudentname": true, "question_groups": [{"name": "Group", "pickingStrategy": "all-shuffled", "pickQuestions": 1, "questions": [{"name": "Statistical Analysis", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Gavin Parker", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/4596/"}], "tags": [], "metadata": {"description": "", "licence": "None specified"}, "statement": "
A student claimed that as study time increases, test scores increase.
\nAfter collecting and analysing some data, the student found the correlation coefficient, r, to be 0.83.
\nWhat does this correlation indicate about the relationship between time spent on studyand test scores?
", "advice": "", "rulesets": {}, "variables": {}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": [], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "1_n_2", "useCustomName": false, "customName": "", "marks": 0, "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "minMarks": 0, "maxMarks": 0, "shuffleChoices": false, "displayType": "radiogroup", "displayColumns": 0, "showCellAnswerState": true, "choices": ["There is a strong positive relationship suggesting that more time spent on study leads to increased test scores.", "There is a strong negative relationship suggesting that more time spent on study leads toincreased test scores.", "There is a moderate positive relationship suggesting that more time spent on study leads toincreased test scores.", "There is a weak positive relationship suggesting that more time spent on study leads toincreased test scores."], "matrix": ["1", 0, 0, 0], "distractors": ["", "", "", ""]}], "type": "question"}, {"name": "Statistical Analysis", "extensions": [], "custom_part_types": [], "resources": [["question-resources/q2a_GQyginy.png", "/srv/numbas/media/question-resources/q2a_GQyginy.png"], ["question-resources/q2b_J7u4opN.png", "/srv/numbas/media/question-resources/q2b_J7u4opN.png"], ["question-resources/q2c_3SN8xFB.png", "/srv/numbas/media/question-resources/q2c_3SN8xFB.png"], ["question-resources/q2d_ckPNw7b.png", "/srv/numbas/media/question-resources/q2d_ckPNw7b.png"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Gavin Parker", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/4596/"}], "tags": [], "metadata": {"description": "", "licence": "None specified"}, "statement": "Which of the following scatterplots would have the greatest positive correlation coefficient?
", "advice": "", "rulesets": {}, "variables": {}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": [], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "1_n_2", "useCustomName": false, "customName": "", "marks": 0, "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "minMarks": 0, "maxMarks": 0, "shuffleChoices": false, "displayType": "radiogroup", "displayColumns": 0, "showCellAnswerState": true, "choices": ["", "", "", ""], "matrix": ["1", 0, 0, 0], "distractors": ["", "", "", ""]}], "type": "question"}, {"name": "Statistical Analysis", "extensions": [], "custom_part_types": [], "resources": [["question-resources/q1a.png", "/srv/numbas/media/question-resources/q1a.png"], ["question-resources/q1b.png", "/srv/numbas/media/question-resources/q1b.png"], ["question-resources/q1c.png", "/srv/numbas/media/question-resources/q1c.png"], ["question-resources/q1d.png", "/srv/numbas/media/question-resources/q1d.png"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Gavin Parker", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/4596/"}], "tags": [], "metadata": {"description": "", "licence": "None specified"}, "statement": "", "advice": "", "rulesets": {}, "variables": {}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": [], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "1_n_2", "useCustomName": false, "customName": "", "marks": 0, "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "prompt": "Some students had their height and foot lengths measured and recorded. The results were graphed and a line of best fit was drawn by four different students as shown.
\n
Which of the following shows the most suitable line of best fit?
You have not attempted any questions. Are you sure you want to exit?
"}, "preventleave": true, "startpassword": ""}, "timing": {"allowPause": true, "timeout": {"action": "none", "message": ""}, "timedwarning": {"action": "warn", "message": ""}}, "feedback": {"showactualmark": true, "showtotalmark": true, "showanswerstate": true, "allowrevealanswer": true, "advicethreshold": 0, "intro": "", "feedbackmessages": [], "enterreviewmodeimmediately": true, "showexpectedanswerswhen": "inreview", "showpartfeedbackmessageswhen": "always", "showactualmarkwhen": "always", "showtotalmarkwhen": "always", "showanswerstatewhen": "always", "showadvicewhen": "never"}, "type": "exam", "contributors": [{"name": "Gavin Parker", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/4596/"}], "extensions": [], "custom_part_types": [], "resources": [["question-resources/q2a_GQyginy.png", "/srv/numbas/media/question-resources/q2a_GQyginy.png"], ["question-resources/q2b_J7u4opN.png", "/srv/numbas/media/question-resources/q2b_J7u4opN.png"], ["question-resources/q2c_3SN8xFB.png", "/srv/numbas/media/question-resources/q2c_3SN8xFB.png"], ["question-resources/q2d_ckPNw7b.png", "/srv/numbas/media/question-resources/q2d_ckPNw7b.png"], ["question-resources/q1a.png", "/srv/numbas/media/question-resources/q1a.png"], ["question-resources/q1b.png", "/srv/numbas/media/question-resources/q1b.png"], ["question-resources/q1c.png", "/srv/numbas/media/question-resources/q1c.png"], ["question-resources/q1d.png", "/srv/numbas/media/question-resources/q1d.png"]]}