2 Measures Of Location And Spread Flashcards
What is the mode?
The value that occurs most often
What is the median?
The middle value of the data
What is the mean?
All the results added together and divided by the total number of results
What is the lower quartile?
One quarter of the way through the data
How can you find the lower quartile?
Divide n by 4
If this is a whole number, the lower quartile is halfway between this data point and the one above
If it is not a whole number round up
Interpolation
The technique used to find median, quartiles and percentiles
What is the interquartile range?
Q3-Q1
What is the inter percentile range?
The difference between the values of two given percentiles
What is the variance?
The mean of the squares minus the square of the mean
What is the formula for the variance?
£x^2/n- (£x/n)^2
What is the formula for standard deviation?
Route of £x^2/n- (£x/n)^2
What is the formula for variance for grouped data presented in a frequency table
£fx^2/£f- (£fx/£f)^2
What formula can be used for standard variation for grouped data presented in s frequency table
Route of £fx^2/£f- (£fx/£f)^2
What is coding?
Coding is a way of simplifying statistical calculations.
