The area under the standard normal curve between z = −1.96 and z = 1.96 is approximately:
✓ Correct Answer: Option B
Standard normal: ±1σ = 68%, ±2σ(1.96) = 95%, ±3σ(2.576) = 99%. Critical values for confidence intervals.
Standard normal: ±1σ = 68%, ±2σ(1.96) = 95%, ±3σ(2.576) = 99%. Critical values for confidence intervals.