Quantitive Data Flashcards
What are the 3 measures of central tendency
Mean
Median
Mode
What group is the mean, medium and mode part of
Measures of Central Tendency
What is the mode
The most frequently occurring value
Advantage of mode
Useful when data is in categories (nominal data)
Disadvantage of mode
Not useful of describing data when there is one or more mode
What is the median
Middle value of scores
Advantage of median
Not affected by extreme scores
Disadvantage of median
Not all values are reflected in final calculation
What is the mean
Arithmetic average
Advantage of mean
Reflects the values of all the data
Disadvantage of mean
Unrepresentative of the data set if there are extreme values
What are the measures of dispersion
Range
IQR
Standard deviation
What is the range
Highest value - lowest value
Advantage of range
Convenient way to express spread out data is
Easy to calculate
Disadvantages of range
Affected by extreme values
Does not take into account the distribution of data
Advantage of IQR
Removes extreme values from data
Advantages of standard deviation
Precise measure of dispersion
Not difficult to calculate using calculator
Disadvantages of standard deviation
May hide extreme values
Cannot be immediately sensed from data
What does the standard deviation work out
How far scores are spread from the mean
Disadvantage of IQR
Can’t be used on its own
What does a small standard deviation score mean
Consistent