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- 1What are nominal scales?They don't scale along a dimension, rather label them.
-Categorical data is often measured on a nominal scale because we assign category labels to observations. - 2What are Ordinal Scales?They are the Simplest and truest scale which orders people, objects, events along the same scale.
We can make:
-same/different comparisons
-greater than/less than conclusions. - 3what is an interval scale?Units which are equally spaced over the scale but have no absolute zero. (no absence of quantity).
we can make:
-Same/different conclusions
-Greater than/less than/ equal conclusions. - 4Ratio ScaleUnits that are equally spaced over the scale. They have a true zero point.
We can make:
-Same/different conclusions
-greater than/less than conclusions
-Equal differences
-ratios. - 5What is the mode?the x value score which has the highest frequency.
- can be bimodal or non existent - 6What is the median? + formula?the middle score.
calculated by:
( N + 1) / 2 - 7What is the mean (+ formula) ?Sum of all scores.
- 8WHat is a deviation score?How far a score is from the mean.
X - mu.
The SUM of all DEVIATION SCORES in a set of observations SHOULD ALWAYS EQUAL ZERO.
- 9General summation notation
- 10Different kinds of frequency graphs:
- 11What is variance and its formula?- measure of dispersion around the mean.
-greater variance = flatter graph
- 12Standard Devation- What is it? Why we need it? and Formula?- variance is in squared units so theres a problem with it being a descriptive measure.
So we need….Standard deviation = This is the average distance each score deviates from the mean and is in the same unit as the scale.
SD is simply the square root of the variance!
- 13Z scores: what is it? and How do we calculate it?a z score is how many SD from the mean a given observation falls.
- 14How can we calculate a persons actual score if we know the mean, SD and z score?
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- Fichas sobre Sin título, creado por a.milios el 09/03/2015.
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