Hi everyone, In Reading 11 " Sampling and Estimation" 's Practice problems, I encountered a question which I can’t understand:
[question removed by moderator]
Does anybody understand why:
- P(2σ)=0.0456 NOT P(2σ)= 0.0228 CUZ according to normal table (z) 1 - P(2σ) = 1 - 0.9772 P(3σ)=0.0026 NOT P(3σ)= 0.0013 CUZ according to normal table (z) 1 - P(3σ) = 1 - 0.9987
- P(|X−μ|≥2σ)≤(1/2)2=0.2500 and P(|X−μ|≥3σ)≤(1/3)2=0.1111. What is question B asking ? and what is the specific meaning of the answer ?