The sum of the values divided by the number of values
1 of 16
Mean(X) = Sum(X) / N -Is this the correct formula for the mean?
Yes
2 of 16
What are the main disadvantages of using the mode?
Can be misleading & not useful with continuous data
3 of 16
What is a fundamental error in statistics?
Only focusing on central measures & ignoring variance
4 of 16
What is the definition of variance?
Mean of the squared distribution around the mean
5 of 16
Var(X) = Sum((X - Mean(X))^2) / N - is this the correct formula for variance?
Yes
6 of 16
What is the standard deviation?
Square root of the variance
7 of 16
What is co-variance?
Measure of how much two random variables vary together
8 of 16
What is a correlation?
Relationship between two variables
9 of 16
What is a positive correlation?
When both variables move in the same direction e.g. - as one variable increases, so does the other one (vice versa)
10 of 16
What is a negative correlation?
Both variables have an inverse relationship e.g - as one variable increases, the other decreases (vice versa)
11 of 16
Why is using statistics important?
All three
12 of 16
A positive correlation means that if a person scores above average in one variable, they will score above average in the other. On a scatterplot, how will this data be visualised?
Data running from bottom-left to the top-right
13 of 16
A negative correlation means that if one-person scores above average on one variable, they will score below average on another. On a scatter-plot, how will this data be visualised?
Dots (data) running from top‑left to the bottom‑right
14 of 16
On a scatter-plot, which variable is on the x-axis (horizontally)?
Independent variable
15 of 16
On a scatter-plot, which variable is on the y-axis (vertically)?
Dependent variable
16 of 16
Other cards in this set
Card 2
Front
Mean(X) = Sum(X) / N -Is this the correct formula for the mean?
Back
Yes
Card 3
Front
What are the main disadvantages of using the mode?
Comments
No comments have yet been made