Question

How do you calculate

1. "The standard deviation of the average as a percent of the average volume"

Also, what does "The standard deviation of the average as a percent of the average volume" mean? What does it imply and how is it relevant to the data analysis?

NOTE: The P1000 and P200 corresponds to micropipettes. Each (P1000 and P 200) had two volumes of measurement with five trials each.

P1000				P200
Trial #	200 microL volume (mL)	1000 microL volume (mL)		Trial #	50 microL volume (mL)	200 microL volume (mL)
1	0.1987	0.9963		1	0.01942	0.1988
2	0.1994	0.04961		2	0.0009800	0.009955
3	0.1994	0.04886		3	0.0009600	0.009960
4	0.1993	0.04887		4	0.0009600	0.009945
5	0.1971	0.04823		5	0.0009700	0.01018
The average volume	0.1987	0.2384		Average	0.004659	0.04776
The Standard deviation of the average volume	0.0009846	0.423679377		The Standard deviation of the average volume	0.008254	0.08441

Answer 1

Here, you take average and average volume as two variables say x and y respectively. You need to introduce a new variable which means average as a percentage of average volume i.e (x/y)*100. This new variable may be called z. Now, the question simply asks you to calculate standard deviation of z.

So, first you have to calculate z values and then calculate standard deviation of z.

This question talks about no new concept, the confusion arises because the variables are themselves named as average and average volume.