How to filter data using Select Case in SPSS?

This video explains how to filter data using select case in SPSS. Filtering the data is the process of extracting subset of data from an existing data file.
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[@winvictorywin5612]

Hello
I am having airborne dust concentrations data for >1 micron size, >3 micron, 5 micron and >10 micron size.
(> means greater than)
These data was taken before and during dust producing work in field study.
N=5
How can i compare these before and during operations data ?
It seems that there is relative percent variation in dust concentrations in atmosphere between before and during operation data. (Taking >1) micron as 100 %)
Before operation:
The relative percent variation of concentration with different particle size is as below. For example
Concentration of >1 micron size particle is 100%.
>3 micron: 80%
>5 micron : 60%
>10 micron: 40%.
During operation:
Concentration of >1 micron size particle is 100%.
>3 micron: 90%
>5 micron : 80%
>10 micron: 70%.
It seems that >10 micron particle share is increased due to that machine operation...?
Which test is suitable for analysing these type similar data for discussion ?
How to use statistics?
Any comparison among these concentrations of different particle sizes ?
thank u.

[@edifo]

You can apply a paired T-Test.

[@winvictorywin5612]

Edifo
Thanks a lot.
Let me try the same.