Find a 95 Percent Confidence Interval for the Difference Between $\sigma$

question 108

Multiple Choice

Find a 95 percent confidence interval for the difference between means where n₁ = 50,n₂= 36, ₁ = 80, ₂ = 75, $\sigma$ ₁² = 5 and $\sigma$ ₂² = 3.

• A)(4.16 5.84)
• B)(3.30 6.70)
• C)(4.40 5.60)
• D)(4.64 5.36)

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