1A single value that attempts to describe a set of data by identifying the central
position within the set of data
Central Tendency
2What are the valid measures of central tendency?
mean, median, and mode
3Equal to the sum of all the values in the data set, divided by the number of values in
the data set.Measures of variability quantify the extent of dispersion (how far apart the scores
are spread)
Mean
4what are the best measures and disadvantage of mean
Best measures: Interval/Ratio (not skewed)
Disadvantage: Susceptible to the influence of others.
5What are the two types of mean
Arithmetis mean and Overall mean
6Mean be used for both discrete and continuous data, but more for __ data.
continuous
7Middle score for a set of data; Usually the middle number in an arranged data set
Median
8what are the best measures of a median
Ordinal; Interval/Ratio (skewed)
9Most frequent score in the data set or the distribution and the easiest to determine.
Mode
10what are the best measures for mode?
nominal
11what are the types of modes and their differences
Unimodal: distribution with one mode
Bimodal: distribution with two modes
Multimodal: distribution with 3 or more modes
12 Mean of Raw Data
Arithmetic Mean
13Measures of __ quantify the extent of dispersion (how far apart the scores
are spread)
variability
14what are the three measures of variability are commonly used in the behavioral sciences?
• the range,
• the standard deviation, and
• the variance
15Difference between the highest and lowest scores in the distribution
range
16Amount of variation or dispersion among the set of values
Standard Deviation
17Lower the standard deviation = score is close to the mean
18Lower standard deviation = values are spread out over a wider range
19Square of the standard deviation
Variance
20Highest Score – Lowest Score (HV – LV)
Range