Signs & Symbols
Definitions
Levels of Measurement
Measures of Central Tendency
Measures of Variability
100
Mu
What is the population mean?
100
Inferential Statistics
What types of statistics do we use to make inferences about a population from a sample?
100
Nominal
What type of variable is categorical in nature?
100
a measure of central tendency that is found by adding all the scores in a distribution and dividing the sum by the number of scores in the distribution
What is the mean?
100
an expression of the extent to which the scores are spread out in a distribution
What is variability?
200
S
What is the sample standard deviation?
200
Descriptive Statistics
What type of statistics do we use when we want to describe or summarize data from samples and populations?
200
Equal-Interval Variable
What type of variable has numbers or values that stand for about equal amounts of what is being measured?
200
An extreme score in a distribution that can affect the mean.
What is an outlier?
200
a measure of variability that is a statement about the highest and lowest scores in a distribution
What is the range?
300
X-Bar
What is the sample mean?
300
a portion of the population
What is a sample?
300
Rank Order Variable
What type of variable conveys information about relative rank or order?
300
the score that cuts a distribution in half.
What is the median?
300
values obtained if the mean is subtracted from each score in the distribution
What are deviations from the mean?
400
Sigma
What is population standard deviation?
400
Anything that can vary, anything that can take on a different quality or quantity.
What is a variable?
400
a variable type such as musical preference that has the following response options: opera, pop, country, rock, and hip hop
What is a nominal variable?
400
the score that appears most often in a distribution.
What is the mode?
400
a measure of dispersion or standard deviation squared
What is variance?
500
N
What is the number of participants in a population?
500
A listing of data or information
What is a data distribution?
500
A type of variable such as educational level that has the following response options: less than high school graduate, high school graduate, college graduate, some college, college graduate, post-college graduate.
What is a rank-order variable?
500
Mean, Median, and Mode
What are the three measures of central tendency?
500
The standard deviation is the square root of the variance and the variance is the standard deviation squared.
What is the relationship between the standard deviation and the variance?
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