Log transformed germ count data

[Steve1235321]

Hi everybody,

I am currently working on a 1st year assignment to make a bar chart of bacterial germ count in (CFU/mL) of various objects that have been disinfected. Since the data between the different objects varies considerably (12 CFU/mL to 3.2 x 10^9 CFU/ml) I thought about log transforming the data.

However, I ran into the following: the counts are performed in triplicate, I would like to calculate a standard deviation of this, do I need to calculate the SD (or even the relative standard deviation) of the log transformed data or of the non-log transformed data.

Thanks in advance for your answers!

Regards,
Steve