Descriptive Statistics Flashcards
Name 3 measures of central tendency.
Mean
Mode
Median
How do you calculate the mean?
add all numbers and divide by the amount
What is the median?
The middle number
What is the mode?
The most common number(s)
What is a strength and limitation for using the mean?
-Representative of all scores
-Can be skewed by extreme scores
What is a strength and limitation for using the median?
-Not skewed by extreme scores
-Doesnt take all scores into account
What is a strength and 2 limitations for using the mode?
-Can be used on all data
-May be several modes
-Ignores other scores
When do you use the mean?
When there are no extreme scores
When do you use the median?
When there are 1 or more extreme scores
When do you use the mode?
When the data is categorical
(multiple of the same number)
What is normal distribution?
When mean mode and median are roughly the same
What is a positive skew?
Where the mean is higher than the mode
What is a negative skew?
When the mean is lower than the mode
Name 2 measures of dispersion
Range
Standard deviation
How do you calculate the range?
Minus the little number from the big number
