# CHAPTER 16 STUDY GUIDE

0 / 5. 0

Subcategory: Criminal law

Level: University

Pages: 1

Words: 275

Chapter 16: Descriptive Statistics
Definition- Statistics used to describe the basic features of the study population. Main concepts include: Frequency Distributions, Central Tendency, Variability, and Risk Indexes.
Levels of Measurement
Nominal- assigning numbers to classify categories. For example, 1 for blood type A and 2 for Blood type B
Ordinal- classification based on ranking. For example, 1 –Poor, 2-Good, 3-Excellent
Interval- Interval scales that assume similarity in the difference between values. For example, 20-40 degrees and 50-70 degrees.
Ratio- Measurements that give rank on an attribute, exact interval, and meaningful attribute. For example height.
FREQUENCY DISTRIBUTIONS -Arrangement of values (x) from lowest to highest and the number of times each value is attained (f).
A set of data is described using 3 characteristics;
Shape of Distributions- Displayed in Graphs using histograms and polygons whose shapes describe data as either skewed, positively skewed, or negatively skewed.
Central Tendency- Use a single value to represent a data set.
Statistical methods used;
Mode- Most frequent occurring value. Used to quickly determine a popular score.
Median- Value at the midpoint. Preferred for a skewed distribution.
Mean- Average value. Majorly used in interval and ratio measurements
Variability- How dispersed or spread distribution is.
Statistical methods used;
Range- Highest value minus lowest value. Mainly used as an unrefined descriptive inde…

Don’t waste time!

Order Original Essay on the Similar Topic

Get an original paper on the same topic

from \$10 per-page