Here's a thoughtful editorial from NYT on averages.

The author, Stephanie Coontz, gives some nice examples of what outliers can do to a mean, and how extreme scores can mislead us about patterns in our data. Have fun reading it!

Instructors: Request an Exam Copy

- Chapter 01; Psychology Is a Way of Thinking (31)
- Chapter 02; Sources of Information (31)
- Chapter 03; Three Claims, Four Validities (63)
- Chapter 04; Ethical Guidelines for Psychology Research (16)
- Chapter 05; Identifying Good Measurement (28)
- Chapter 06; Surveys and Observations (27)
- Chapter 07; Sampling (23)
- Chapter 08; Bivariate Correlation Research (82)
- Chapter 09; Multivariate Correlation Research (51)
- Chapter 10; Introduction to Simple Experiments (87)
- Chapter 11; More on Experiments (27)
- Chapter 12; Experiments with More Than One Independent Variable (39)
- Chapter 13; Quasi-Experiments and Small-N Designs (41)
- Chapter 14; Replicability, Generalization, and the Real World (46)
- Complex Experiments (Factorial Designs) (13)
- Correlational Studies (60)
- Ethics (10)
- Experiments (61)
- External Validity (14)
- Finding and Reading Literature (5)
- Identifying Claims (12)
- Internal Validity (10)
- Is this causal claim justified? (65)
- Multivariate Studies (26)
- Online Resources (22)
- Questions and Answers (75)
- Questions Only (130)
- Replication Updates (11)

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