Mean
Why ask such mean questions?
Well, when we compare two (or more) groups, the mean of that group for a particular measure helps us in determining if these groups are different.
In maths, the mean is written as below:
Well, when we compare two (or more) groups, the mean of that group for a particular measure helps us in determining if these groups are different.
In maths, the mean is written as below:
which if you were to write it in full, would look like this:
Too many symbols. What does it all mean?
Here, the X bar represents "mean". Sometimes, we can also use M to represent "mean".
"x" is the individual score for each person in a group
Sigma (the funny E sign) is the sum sign. This helps us lazy people from having to write + + + + + + + + +
"n" is the number of persons in our
Here, the X bar represents "mean". Sometimes, we can also use M to represent "mean".
"x" is the individual score for each person in a group
Sigma (the funny E sign) is the sum sign. This helps us lazy people from having to write + + + + + + + + +
"n" is the number of persons in our
Different types of means
So we can calculate the mean of individuals within a group.
Lets say we have 2 groups.
Group A has 3 people with scores of 9, 10 and 11
Group B has 5 people with scores of 27, 24, 35, 33, 31
Mean of group A=10 and mean of group B=30
Can you figure out how we calculated this?
(answer provided below)
We can also calculate the mean of all groups in our sample.
In the example above, the mean across our two groups would be = 20.
Lets say we have 2 groups.
Group A has 3 people with scores of 9, 10 and 11
Group B has 5 people with scores of 27, 24, 35, 33, 31
Mean of group A=10 and mean of group B=30
Can you figure out how we calculated this?
(answer provided below)
We can also calculate the mean of all groups in our sample.
In the example above, the mean across our two groups would be = 20.
Answer for question above:
If we look at the formula above, our x1=9, x2=10, x3=11, and n=3