Statistical Diagrams Flashcards
What does the area of a histogram represent
Frequacy
What does the height of the histogram represent
Frequency density
What does the width of a histogram represent
Class width
Define skewness
The distortion of the data
What does the box plot look like if there is no skew
It is symetrical
What does the box plot of a positive skew look like
The median is towards the min. Of the box plot
What does the box plot of a negative skew look like
The median is towards the max. Of the box plot
What is considered an outlier in a box plot
When the value is 1.5 IQR’s beyond the upper and lower quartile.
What is the formula for an outlier which is towards the minimum
Lower quartile - 1.5X IQR
What is the formula for the outlier of a box plot which is towards the maximum
Upper quartile + 1.5 X IQR
Where is the dependant variable on the axis of a graph
It is on the y axis
What does -1, 0 and 1 represent as a part of product moment correlation coefficient
-1= perfect negative correlation
0= no correlation
1= perfect positive correlation
What is the equation for the regression line
Y= a + bx
Name the measure of location
Maximum
Min
Measures of central tendency (mean median mode)
Quartile
Name the measures of spread
Range
IQR
