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{
    "url": "https://numbas.mathcentre.ac.uk/api/questions/7656/?format=api",
    "name": "Find mean and standard deviation of differences between samples",
    "published": true,
    "project": "https://numbas.mathcentre.ac.uk/api/projects/4/?format=api",
    "author": {
        "url": "https://numbas.mathcentre.ac.uk/api/users/7/?format=api",
        "profile": "https://numbas.mathcentre.ac.uk/accounts/profile/7/?format=api",
        "full_name": "Christian Lawson-Perfect",
        "pk": 7,
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    "edit": "https://numbas.mathcentre.ac.uk/question/7656/find-mean-and-standard-deviation-of-differences-be/?format=api",
    "preview": "https://numbas.mathcentre.ac.uk/question/7656/find-mean-and-standard-deviation-of-differences-be/preview/?format=api",
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    "source": "https://numbas.mathcentre.ac.uk/question/7656/find-mean-and-standard-deviation-of-differences-be.exam?format=api",
    "metadata": {
        "description": "\n    \t\t        \t\t<p>An experiment is performed twice, each with $5$ outcomes</p>\n    \t\t        \t\t                    <p>$x_i,\\;y_i,\\;i=1,\\dots 5$&nbsp;. Find mean and s.d. of their differences $y_i-x_i,\\;i=1,\\dots 5$.</p>\n    \t\t        \n    \t\t",
        "licence": "None specified"
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