I am afraid I misunderstand the results of the Single sample t-test. For example:
Iris dataset, second numeric column (sepal width) with 3.0 as test mean (measured: ~3.054). I get:
%
CI (Lower)
CI (Higher)
90
-0.0046
0.1126
95
-0.0160
0.1240
99
-0.0384
0.1464
Should not those get narrower and narrower intervals? Isn't it usual to report the absolute values not the relative to the test value?
Thanks, gabor
PS: Sorry, for some reason the table is not visible as it is in the editor window. I have made some emphasis in the data (header and the CI in % values)
I would expect the results to get broader and broader, because to be 99% confident, you would require a broader range, whereas you can be less confident at 90% say, that the results fall within a narrower range.
I would assume the data shown is the relative results, in that this range is how far above and below the mean value of 3. i.e. that at 99% confidence, the true mean lies between 2.9616 and 3.1464. That is how I understand the data.