Statistics for Business: Decision Making and Analysis, 3rd Edition

N

• NASA, Columbia space shuttle, 3

• NASDAQ, 224. See also Association: between random variables

• Natural gas. See Gas heating

• Natural logs, 149n

• No obvious lurking variable condition, 510

• Nominal variables, 13. See also Categorical data and variables

• Nonlinear patterns. See also Curved patterns

  • association between numerical variables, 122–123

  • detecting, 529–531

• Nook Tablet, 2

• Normal model and random variables

  • best practices, 287

  • chi-squared and, 476–477

  • definition, 274

  • departures from normality, 282–287

  • examples

    • sampling variation, 306–312

    • SAT, 277–278

    • VaR, 281–282

  • exercises, 291–297

  • main discussion, 271–277

  • pitfalls, 288

  • software hints, 289–290

  • standardizing, 276

  • testing proportions and, 396

  • using tables, 278–279

  • variation, averaging, and, ...