Central Tendency And Variability Flashcards
1
Q
What is variability
A
How spread out the scores are in a distribution
2
Q
What are the measures of variability
A
- range
- interquartile range
- variance
- standard deviation
3
Q
What is “the range”
A
Difference between the highest and lowest obtained scores
4
Q
How do u calculate “the range”
A
Highest score - lowest score
5
Q
How do u calculate the IQR
A
- find median
- find middle score in top and bottom halves
- minus those scores to get IQR
6
Q
What does the variance tell us
A
How spread out a set of scores is around their mean
7
Q
How do you calculate variance
A
- Minus the mean from each number
- square each deviation score
- add all of them together
- divide by the N
8
Q
How do u calculate sum of squares
A
- same calculation as variance minus the last step
9
Q
What is standard deviation
A
Measures how far apart numbers are in a data set
10
Q
How do you calculate sd
A
Square root of variance
11
Q
In what skew is the median bigger than the mean
A
Left
