Show:
Averages
Variability
Data Visualization
Correlation
Truth
100
Measures of central tendency
What are averages?
100
Refers to how scores differ from one another
What is variability?
100
A range of numbers
What is a class interval?
100
A numerical index that reflects the relationship between two variables.
What is a correlation coefficient?
100
Whether a test measures something consistently?
What is reliability?
200
Calculated by adding up the values of observations and dividing by the number of observations.
What is the arithmetic mean?
200
The most general measure of variability
What is range?
200
A visual representation of the frequency distribution where the frequencies are represented by bars
What is a histogram?
200
Not causality.
What is correlation?
200
A score we can't directly measure because it is a theoretical reflection of the actual amount of the trait or characteristic possessed.
What is true score?
300
An average defined by the midpoint of a set of scores.
What is a median?
300
The average distance from the mean.
What is standard deviation?
300
A continuous line that represents the frequencies of scores within a class interval
What is a frequency polygon?
300
Indirect correlation
What is the term for when two variables change in opposite directions?
300
Used when you want to determine if a test is reliable over time.
What is test-retest reliability?
400
The value that occurs most frequently in a data set.
What is the mode?
400
The standard deviation squared
What is variance?
400
Also called an ogive
What is a cumulative frequency polygon?
400
The range of possible values for correlation?
What is -1 to 1?
400
Indicates that the tool does what it says it does.
What is validity?
500
Characteristic of a data set that determines which measure of central tendency is appropriate.
What is scale of measurement?
500
Standard deviation is sensitive to this, just like the mean
What is extreme scores?
500
Used to show the proportion of an item that makes up a series of data points.
What is a pie chart?
500
Represented by a small letter r.
What is Pearson product-moment correlation?
500
The way to establish content validity.
What is ask an expert?