Measurement
Continuous and discrete variables are this type of variable.
Good this validity is evidence that the content of a test corresponds to the content of what it is meant to measure.
This is the 'average' of scores.
What is the mean?
Average dispersion is also known as this.
What is the variance?
These allow us to blank.
What is standardize a score?
This type of data tells us the order in which certain things have occurred.
What is ordinal?
This is evidence that the results of a study can be applied and allow inferences to the real world.
What is ecological validity?
This is the middlemost score when all scores are in order.
What is the median?
The square root of the variance gives us this.
What is the standard deviation?
The distribution of z-scores has a mean of this and an SD of this, respectively.
What are 0 and 1?
This special type of variable is nominal with two categories.
What is binary?
This ensures that an instrument measures what it claims to measure through comparison to objective criteria.
What is criterion validity?
This is the most frequent score.
What is the mode?
If all scores were the same, this would be zero.
What is the standard deviation?
Z-scores describe the score as how many these it is away from the mean.
What are standard deviations?
This variable has no true zero and equal spacing between values.
What is interval?
This is the ability of a measure to produce consistent results across multiple points in time.
What is test-retest reliability?
What is kurtosis?
This indicates the total deviance of scores from the mean.
What is sum of squared errors?
The formula for a z-score is this.
This variable has a true zero and could be something like height.
What is ratio?
The general principle of having high this is that an instrument consistently measures what it is supposed to.
What is reliability?
This refers to the symmetry of a distribution and tells you where the tail is pointing.
What is the skew?
The sum of squares, variance, and SD all represent these three things.
What are variability, error, and how well the mean truly represents the data?
This tells us whether the original score was above or below the mean.
What is the sign of the z-score?