Histograms Flashcards
What is the Formula for Frequency Density?
Frequency Density = Frequency ÷ Group width
Group width is the…
Width of the bars
Frequency (from bar area) =
Area of bar = Base x height = Frequency
% =
(Frequency ÷ Total number of people surveyed) x 100
Mean (graphs) =
Data x frequency
If you get a median of 0.5, you…
Round up to the next position
When deciding if the mean, median, or mode is most suitable, ask…
Is it affected by extreme values?
Why is data used?
To inform decisions
Why is data used?
To inform decisions
What are the 2 types of data?
Qualitative and Quantitative
2 types of Quantitative data?
Discrete (whole numbers)
e. g. number of siblings
Continuous (decimals)
e.g. weight
Box plot info is….
Mininimum LQ Median UQ Maximum
LQ =
1/4 (n+1)th term
UQ =
3/4 (n+1)th tern
Median (Quartile formula) =
2/4 (n+1)th term
