Signs & Symbols

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?