Statistics Flashcards
Range
highest to lowest number in a population
Mode
Value that occurs most often in a population
Population
All recorded observations in a study
Sample
Specific defined portion/group of a population
Positive correlation between variables
When a positive (high) on one variable produces a positive (high) result on another variable
Negative correlation
When a reduction in one variable leads to a decline in another variable
Random Sample
A set of items that have been drawn from a population in such a way that each time an item was selected, every item in the population had an equal opportunity to appear in the sample.
Why is random sample important?
To provide an approximation of the characteristics of the population
Normal distribution
One that is symmetrical around the mean. A bell curve
Inferential Statistics
The characteristics of a population based on observations on a sample of the population
What are the tree methods of reporting Central Tendency?
Mean, Median, and/or Mode
Median
The middle number in a distribution
Examples of nominal data
Race, SSN, sex. Mutually exclusive groups that lack intrinsic order
What is the only measure of central tendency that can be used for nominal data?
Mode
Name the methods of central tendency that can be used for ordinal data
Mode and median
