Wed 3 Mar, 2021 12:59 pm - This s sorta a weighted average, sqrt (var 1/n1 + var 2 / n2), but why not
sqrt((var1*n1 + var2*n2)/n1+n2) ? Maybe it's me, it ain't clicking yet.
Thanks;
joe b. (view)
Wed 3 Mar, 2021 08:34 am - Let me see if I understand.
If var1 not equal var 2,the formula sums the two variances.
The new t distribution then is a dist where sigma = sqrt (sum of 2 var.)
This kinda Z test solves for P... (view)
Wed 3 Mar, 2021 05:35 am - I understand z = (x1-x2)/(sigma/sqrt n).
I do not understand the 2 sample z formula z = (x1-x2)/sqrt(var1/n1+var2/n2)
What is the denominator about?
does (sigma/sqrt n) = sqrt(var1/n1+var2/n2)?... (view)
Tue 8 Mar, 2016 05:18 am - Writing about the past. Having trouble with tense in chapter headings.
Is it
George Washington crossed the Delaware. or
George Washington crosses the Delaware.
The Pilgrims arrived in... (view)
