**Thank you so much. **

Is this too good to be true? I put in the improvement result compared to the national expectation of result and it says it's 'extremely statisticaly significant' (see cut and paste below)! Have I done it wrong or has my research actually worked?! Can I say somthing like... 'The Paired T-test shows that the rate of progress after the intervention is significantly better than the expected rate of progress with no intervention at a 95%confidnece level' ?

I wish I'd remembered all this stuff!

Thanks again :wave:

Paired t test results

P value and statistical significance:

The two-tailed P value equals 0.0009

By conventional criteria, this difference is considered to be extremely statistically significant.

Confidence interval:

The mean of improvement minus prediction equals 0.900

95% confidence interval of this difference: From 0.441 to 1.359

Intermediate values used in calculations:

t = 4.2094

df = 14

standard error of difference = 0.214

Learn more:

GraphPad's web site includes portions of the manual for GraphPad Prism that can help you learn statistics. First, review the meaning of P values and confidence intervals. Next check whether you chose an appropriate test. Then learn how to interpret results from an unpaired or paired t test. These links include GraphPad's popular analysis checklists.

Review your data:

Group improvement prediction

Mean 1.400 0.500

SD 0.828 0.000

SEM 0.214 0.000

N 15 15