I am trying to compare results from 2 pieces of test equipment to see if their results are statistically different. Problem is the experiment looks like this example;

Test kit 1 Test Kit 2

Sample 1 12.62 11.97

Sample 2 13.33 14.01

Sample 3 10.55 10.87

Sample 4 15.52 15.01

etc

All samples are 100% wool but each sample is from a different breed, type etc. So we are not comparing the means and variances of two true sets of data i.e. 20 replicates of Sample 1 on both bits of kit, so a simple t test will not help.

I am trying to understand if both bits of kit are significantly different or if the variance between results is normal so the kits could be viewed as being 'in calibration'. I suppose it is a bit like a laboratory correlation trial.

Any advice much appreciated.

Thanks,

David