Unknown Mean and Variance

Unknown Mean and Variance

• X~N(μ, σ^2)
• Let Z=X-μ/σ
• NB: Table 3 contains probabilities
• Table 4 contains Z-values for selected probabilities

For One Unknown

• Use Z=X-μ/σ with available values
• Find Q-value that gives probability
• Let X-μ/σ = Q-value

For Two Unknowns

• Use the same method as for One Unknown
• WIll end up being Simultaneous Equations that need to be solved