Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
|
Frequency
|
is the number of participants or cases
Symbol for Frequency = f Symbol for # of Participants= N |
|
|
Proportion
|
Is part of one.
are harder to interpret than percentages |
|
|
frequency distribution
|
is a table that shows how many participants have each score
|
|
|
Frequency polygon
|
Is a drawing that shows how many participants have each score
|
|
|
Normal Curve
|
Is the most important type of curve.
Often found in nature Used as basis for inferential statistics |
|
|
Positive Skew
|
is used to describe a skewed distribution in which there is a long tail pointing to the right.
Ex: Plotting distribution of income |
|
|
Negative Skew
|
describe a skewed distribution in which there is a long tail pointing to the left
|
|
|
Bimodal distribution
|
have two high points
such a curve is most likely to emerge when human intervention or a rare event has changed the composition of a population |
|
|
Mean
|
Most frequently used average
is the balance point in a distribution of scores |
|
|
Drawback of the Mean
|
It is pulled in the direction of extreme scores.
|
|
|
A synonym for average is
|
measure of central tendency
|
|
|
Which average always has 50% of the cases below it?
|
Median
|
|
|
Median
|
Is the middle point in a distribution
Is insensitive to extreme scores |
|
|
Variability
|
Refers to differences among the scores of participants
|
|
|
What are the two synonyms for variability
|
Spread and dispersion
|
|
|
Range
|
difference between the highest score and the lowest score
Weakness: is based only on 2 numbers |
|
|
Outliers
|
are scores that lie far outside the range of the vast majority
|
|
|
IQR
|
interquartile Range: is the range of the middle 50% of the participants.
It is better than the range because it ignores outliers |
|
|
Standard deviation
|
statistic that provides an overall measurement of how much participants' scores differ from the mean score of their group
design to describe the Normal Curve |
|
|
Standard Deviation Rules
|
1. about 2/3 of the cases lie w/in +-1 Sd
2. 95% +-2 Sd 3. 99% +-3 SD |
