- #1
craig100
- 8
- 0
Hello There,
I'm after a little advice; I have data collected during experimentation that was designed to determine the improvement of two groups of subjects between a pre and a post-test. The results are as follows:
Pre & Post test numbers represent the number of errors made
Group 1:
Group 2:
I'm applying the t-test to determine if there is a statistical difference between the means(of the improvement columns).
My question is really simple(hopefully)... in group 2, should I be recording improvement as a negative number? or simply zero?
Using zero will not give me a significant statistical difference between the means of group 1 and group 2... using the negative numbers does.
Also, if I'm keeping the negative improvement numbers, is it okay to represent improvement as a negative percentage?
I've not done much with statistics, so would appreciate your input.
Thanks,
Craig.
I'm after a little advice; I have data collected during experimentation that was designed to determine the improvement of two groups of subjects between a pre and a post-test. The results are as follows:
Pre & Post test numbers represent the number of errors made
Group 1:
Code:
Pre|Post|Improvement
0 0 0
1 0 1
5 4 1
12 0 12
2 0 2
7 6 1
0 0 0
13 0 13
Group 2:
Code:
Pre|Post|Improvement
0 1 -1
2 0 2
1 0 1
0 0 0
0 11 -11
5 23 -18
I'm applying the t-test to determine if there is a statistical difference between the means(of the improvement columns).
My question is really simple(hopefully)... in group 2, should I be recording improvement as a negative number? or simply zero?
Using zero will not give me a significant statistical difference between the means of group 1 and group 2... using the negative numbers does.
Also, if I'm keeping the negative improvement numbers, is it okay to represent improvement as a negative percentage?
I've not done much with statistics, so would appreciate your input.
Thanks,
Craig.