Data
Categories with no inherent order
What is nominal level data?
The most frequent observation
Mode
Variables that take only values of 0 or 1
Dichotomous/Dummy variable
The symbol for mean in populations
Mu
The level of isomorphic data, can use mean, median, and mode
What is interval level data?
The middle observation
Median
A plot of the frequencies of observations at each value level
Distribution
The symbol for standard deviation in populations
Sigma (lower-case)
Like nominal data, except there is an inherent order
What is ordinal level data?
The average value of the observations
Mean
The three values for 1, 2, and 3 standard deviations, respectively
68-95-99.7 law
The symbol for mean in samples
X bar
The number of observations at a specific value level
What is frequency?
The square root of the variance; measures the spread of the distribution. Like the average distance from the mean
Standard deviation
A distribution with two peaks
Bimodal distribution
How many standard deviations a value is from the mean
Z score
The value of a variable
What is indicator?
A distribution in which the mean and median are in the same place
Normal distribution
A statistic that describes the relationship between two variables
Inferential statistic
In the standard deviation, the denominator is (n-1)
Sample