Table 2 Descriptive Details of the Group 1 (Surface Roughness) (Unit – Ra).

From: Effect of electrical grade glass fibres and silver nanoparticles on the mechanical properties of provisional PMMA material

Subgroup

N

Mean

Std. deviation

Std. error

95% Confidence interval for Mean

Min

Ma

Lower bound

Upper bound

SG1A

10

0.1575

0.16357

0.0517

0.0405

0.2745

0.04

0.54

SG1B

10

0.1871

0.22972

0.0726

0.0227

0.3514

0.05

0.70

SG1C

10

0.1842

0.12535

0.0396

0.0945

0.2739

0.06

0.49

SG1D

10

0.1307

0.12322

0.0389

0.0426

0.2188

0.06

0.44

Total

40

0.1649

0.16130

0.0255

0.1133

0.2165

0.04

0.70

  1. SG1A – Subgroup 1A – PMMA; SG1B – Subgroup 1B – PMMA + AgNPs; SG1C – Subgroup 1C – PMMA + E-glass fibres; SG1D – Subgroup 1D – PMMA + AgNPs + E-glass fibres.
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