Chapter 19 - From Data Production to Inference: Part III Review - Supplementary Exercises - Page 450: 19.53b

n = 100, μ = 3.3, σ = 0.8 $\frac{σ}{\sqrt n} = 0.8/10 = 0.08$ According to Empirical rule, 99.7% of the observations are within three S.D. Hence: 3.3 ± 3(0.08) = 3.06 to 3.54

n = 100, μ = 3.3, σ = 0.8 $\frac{σ}{\sqrt n} = 0.8/10 = 0.08$ According to Empirical rule, 99.7% of the observations are within three S.D. Hence: 3.3 ± 3(0.08) = 3.06 to 3.54