Compute a 95% CI for the variance of the concentrations?

Obstetrics, Serology

A new assay is developed to obtain the concentration of M. hominis mycoplasma in the serum of pregnant women. The developers of this assay want to make a statement on the variability of their laboratory technique. For this purpose, 10 subsamples of 1 mL each are drawn from a large serum sample for one woman, and the assay is performed on each subsample. The concentrations are as follows: 2⁴, 2³, 2⁵, 2⁴, 2⁵ 2⁴ 23, 2⁴, 2⁴, 2⁵.