Summary
Contents
Subject index
This text introduces the essentials of the statistical technique. Rather than rote memorization of formulae, the emphasis is on developing an understanding of the underlying logic of statistics. Toward that end, the author uses an informal prose style, and avoids overwhelming the reader with complex notation and derivation. There are numerous exercises and problems graded for difficulty. A list of Greek symbols used in statistics is found inside the back cover for quick reference.
Describing the Position of Scores in Distributions
Describing the Position of Scores in Distributions
Learning Objectives
After reading this chapter, you should be able to do the following:
- Define the term derived score.
- Define percentile and percentile rank, and provide an example for each.
- Compute percentiles from a given set of data.
- Compute percentile ranks from a given set of data.
- Define the term z score.
- Calculate z scores for a given set of data.
- List the properties of a z distribution.
- Use z to locate the position of scores in a distribution.
When my friend Millie took her infant son Jake for his 6-week checkup, she learned that his body size was at the 50th percentile but his head circumference was at the 99th percentile!
It has been estimated that home-schooled students, on average, score at the 80th percentile in reading, ...
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