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      "id" : "7DD8BCFD-B17D-567A-9938-A97935BD51A5",
      "source" : "# Normal distribution z-scores"
    },
    {
      "id" : "D0DFBAAB-1BE2-58B1-9354-3D85F65DB951",
      "source" : "\/\/ Test scores are normal with mean 75 and standard deviation 8."
    },
    {
      "id" : "A3FF0B20-4614-5036-A455-B7AF0CA5F63E",
      "source" : "mean = 75"
    },
    {
      "id" : "53108288-EF51-5EB1-BEBE-4D71279F91BA",
      "source" : "standard deviation = 8"
    },
    {
      "id" : "A3145D48-3328-52BD-BD69-6E12E6ECB315",
      "source" : "score = 91 in 50 … 100"
    },
    {
      "id" : "6FE9BDA5-8128-591C-BFED-EEA0F7751069",
      "source" : "z score = (score - mean)\/standard deviation"
    },
    {
      "id" : "C9616B94-DECC-532F-9971-06239B663CE8",
      "source" : "\/\/ The share of scores below this one: area under the standard normal curve."
    },
    {
      "id" : "BA828F0C-8D34-52A1-A847-F02FF0BB27DA",
      "source" : "percentile = integral(e^(-x²\/2)\/sqrt(2*π), x, -10, z score) in %"
    },
    {
      "id" : "F5F27C53-F642-5D33-A044-279FF1BF0E90",
      "source" : ""
    },
    {
      "id" : "2EF9389F-74B7-54AF-9B45-5AC32375FFE1",
      "source" : "# Sampling and margin of error"
    },
    {
      "id" : "F06A62E2-BF0A-5F8B-94F5-6EB068DF79ED",
      "source" : "\/\/ 1,000 people polled, 44% said yes. 1.96 gives 95% confidence."
    },
    {
      "id" : "7E861D33-1F71-589F-8468-329BC82DD5F1",
      "source" : "sample size = 1000"
    },
    {
      "id" : "EDE23918-4F8E-53AB-90BF-DBE753AF13F1",
      "source" : "sample proportion = 44%"
    },
    {
      "id" : "DCC3F475-514B-50BF-95EC-1D08BDEE68E6",
      "source" : "margin of error = 1.96*sqrt(sample proportion*(1 - sample proportion)\/sample size) in %"
    },
    {
      "id" : "2247CEC9-ADAC-5EAC-AB5C-52B4E023B575",
      "source" : "low = sample proportion - margin of error"
    },
    {
      "id" : "D881C226-3E43-5AE9-8549-FE767A4773DB",
      "source" : "high = sample proportion + margin of error"
    }
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  "title" : "Statistics: z-scores and polls"
}