Super Statistics Flashcards
The mode is
the piece of data that occurs the most
The median is
The value in the middle (make sure you write them in order first)
To find the mean
add all the items together then divide by how many there are.
To find the range
Biggest - Smallest
Type of correlation?
Negative Correlation
As speed increases time decreases
Type of correlation?
No correlation
The house number has no impact on IQ
Type of correlation?
Positive correlation
A higher Maths score links to a higher Science score
Making predictions from scatter diagrams always . . .
draw on a line of best fit
Use a bubble sliced in half to help you get it in a good position.
Pie Charts
To draw a pie chart you need to find the angle needed by . . .
Work out the fraction of the total for each section, then multiply by 360
When asked to write a question for a questionnaire. Always do two things . . .
Write a good question
Provide responce boxes
Mean from a frequency table
create an fx column (frequency x the value)
mean = total fx ÷ total f
Mode from a frequency table
The value or group with the highest frequency
Mean from a grouped frequency table
create a mid-point column and an fx column
mean = total fx ÷ total f
Cumulative Frequency
Keep a running total
Cumulative frequency curve
plot the cumulative frequency points at the end of the group
Join with a curve (‘S’ shape)
