Have U a firm grasp of Prediction Intervals ?

Given b+/- Sbtc for prediction internals, how do you get Sb if it is not given? (Ref: do we need to memorise Eqn 11 - 15 page 252 in the CFA text?} See question 11 page 261 of cfai text

memorise, or add a bit to standard error.

chrismaths, you made me laugh out loud to my lap top? where from this idea of add a bit? seems to ‘work’ from my example…any idea what the size of the ‘bit’ should be?

more than a smidgen, less than a chunk