Reanne - 6th Grade - Math - Measures of variability
What is a display that shows how the values in a data set are distributed or spread out called?
A box plot.
How many values do you need for the data set to make a box plot?
What is the definition of the lower quartile?
The median of the lower half of the data.
What does median mean?
The middle number when all numbers are placed in order.
What are the five values needed for the data set to make a box plot?
The least value, the lower quartile, the median, the upper quartile and the greatest value.
Define a measure of variability.
A single number that describes the spread of a data set.
What is one measure of variability?
An interquartile range (IQR).
What is the interquartile range (IQR)?
It is the difference of the upper quartile and the lower quartile.
What is another measure of variability?
The mean absolute deviation (MAD).
What is the mean absolute deviation (MAD)?
It is the mean distance between each data value and the mean of the data set.
What does mean mean?
It is the average of a group of numbers. For example the numbers, 1, 2 and 3. Add them up and then divide by the number of numbers - 1 + 2 + 3 = 6 then divide by 3 = 2. 2 is the average of the numbers.