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Table 2 Statistics: residual concentrations of starch (measured by optical density after reaction with iodine) in the R. rubrum culture after 2 h exposition in the static magnet field (SMF)

From: Application of static and impulse magnetic fields to bacteria Rhodospirillum rubrum VKM B-1621

Nos. of the data groups Ranges of the SMF, mT Number of wells (number of the data in the group, n) OD
Average mean (x) Sample variance (s2)
1 0.0–0.5 18 3.01 0.285256
2 0.6–1.0 18 3.27 0.103128
3 1.1–3.0 18 3.25 0.252374
4 3.6–16.0 18 3.27 0.144751
5 16.0–85 18 3.22 0.165431
6 120–173 6 3.15 0.228619
\({\text{s}}_{\text{A}}^{2}\) 0.182701    
\({\text{s}}_{\text{G}}^{2}\) 0.116315    
F = \({\text{s}}_{\text{A}}^{2} /{\text{s}}_{\text{G}}^{2}\) 1.57075    
F0.95 2.315689    
  1. F < F0.95 thus, there is no difference between the groups of the data at the 95% level of degrees of freedom