Chapter 9. Comparing Two Means

  • 9.1 Introduction 224

    • 9.1.1 Hypotheses for Comparing Two Means 224

    • 9.1.2 Paired t-Test versus Two-Sample t-Test 225

  • 9.2 Two-Sample t-test 227

    • 9.2.1 Detail Example: Comparing Processor Speeds of Two Brands 228

    • 9.2.2 Two-Sample t-test in JMP 230

    • 9.2.3 Interpretation of Two-Sample Results 232

  • 9.3 Paired t-test 233

    • 9.3.1 Detail Example: Advertising Effect in Test Markets 234

    • 9.3.2 Paired t-test in JMP 236

    • 9.3.3 Interpretation of Paired t-test Results 237

  • 9.4 Paired t-test versus Two-Sample t-test on the Same Data 238

    • 9.4.1 Example: Abrasion Resistance 238

    • 9.4.2 Summary of Differences between the Paired and Two-Sample t-test 240

  • 9.5 Summary 241

9.1 Introduction

Many business problems require the comparison of two processes or two populations. ...

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