When We Test H₀: μ₁ ≤ μ₂, H_A: μ₁ >

question 34

Short Answer

When we test H₀: μ₁ ≤ μ₂, H_A: μ₁ > μ₂ at α = .10, where ₁ = 77.4, ₂ = 72.2, s₁ = 3.3,
s₂ = 2.1, n₁ = 6, and n₂ = 6, can we reject the null hypothesis (using critical value rules)? (Assume equal variances.)

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Definitions:

Arachnoid Granulations

Small protrusions of the arachnoid membrane through the dura mater; they allow cerebrospinal fluid to enter the venous system.

Blood-brain Barrier

The blood-brain barrier is a selective barrier that prevents most substances in the blood from entering the brain, protecting it from pathogens and toxins.

Myelin Sheath

Envelope surrounding most axons; formed by Schwann cell membranes being wrapped around the axon.

Circle of Willis

A circular network of arteries at the base of the brain that supplies blood to the brain and surrounding structures.