relationship between t-test CI and SEM?

Thanks for the replies and apologies for not including code. Bad of me.

>I get the same confidence intervals with t.test(), lm(), and by hand. 
  >We need to see how you calculated the SEM and constructed the 
interval.  >Perhaps you constructed the interval using the normal 
distribution >rather than the t distribution?

Yes, I was doing this and this was causing a confusion.

I think it's clear now!


Rob