- #1
mattkunq
- 14
- 0
Hello People,
I'm and just somewhat confused about this topic.
Lets say I have a sample set A with sample size= 101 mean =10 and sample stdv of 1
then sample set B with sample size= 100 Mean=15 with sample stdv of 2.
If i add these two samples sets together I should get a new stdv that is no smaller than the smallest stdv of the two. Right?
If you don't agree please tell so I know I am wrong but if you do think that it is true, then here is my confusion.
Fourier Series and make a straight line say(y=1) a sum of different sine/cosine waves.
Now if I take the x values as the sample names and the y-axis values as the test values of that sample. I can calculate a sample stdv for each wave. If i add the whole Fourier series together and get a straight line I would get a Stdv of zero. Which is less thant whatever the individual cosine/sine waves stdv were.
Thank you =)
I took one engineering stats course.
I'm and just somewhat confused about this topic.
Lets say I have a sample set A with sample size= 101 mean =10 and sample stdv of 1
then sample set B with sample size= 100 Mean=15 with sample stdv of 2.
If i add these two samples sets together I should get a new stdv that is no smaller than the smallest stdv of the two. Right?
If you don't agree please tell so I know I am wrong but if you do think that it is true, then here is my confusion.
Fourier Series and make a straight line say(y=1) a sum of different sine/cosine waves.
Now if I take the x values as the sample names and the y-axis values as the test values of that sample. I can calculate a sample stdv for each wave. If i add the whole Fourier series together and get a straight line I would get a Stdv of zero. Which is less thant whatever the individual cosine/sine waves stdv were.
Thank you =)
I took one engineering stats course.