maxmeomeo Wrote: ------------------------------------------------------- > Sorry but I dont understand what you really mean. > Can you please repost their answer? I encouter the > same difficulty in figuring out why they have that > answer. Thanks Max it’s very easy…don’t sweat!..it’s the difference between “sample” and “population”…pay attention! Like in other areas as well such as standard deviation also treats sample and population differently by considering n-1 for sample and n for population so the same difference is here n+1 for population and n for sample…Makes sense?
Oh ok thank you 
Guess im too nervous to see thing properly 
So I guess we have to pay attention to the wording of the question… If population: n+1 * y/100 If sample: n*y/100 It would of been nice if this was clearer in the material studied…
Thank you for the clarification!!!
This three-year-old bit of advice is, alas, quite wrong.
It makes no difference if the data represent a sample or a population, the formula for the position of the _y_th percentile is (n + 1) × y/100.
It’s _ never _ n × y/100.