THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

question 139

Essay

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Suppose that x₁ and x₂ are random samples of observations from a population with mean μ and variance σ².Consider the following three point estimators,X,Y,and Z,of μ: X = (x₁ + x₂)/2,Y = (x₁ + 3x₂)/4,and Z = (x₁ + 2x₂)/3.
-Find the relative efficiency of X with respect to each of the other two estimators Y and Z.

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Definitions:

Tectum

Roof (area above the ventricle) of the midbrain; its functions are sensory processing, particularly visual and auditory, and the production of orienting movements.

Tegmentum

The tegmentum is a part of the brainstem involved in movement and arousal; it helps regulate many basic functions of life including awareness, and the modulation of pain.

Glial Cells

In the nervous systems, both central and peripheral, there exist cells that are not neurons but serve to protect and support neuronal cells.

Neurons

The basic working units of the brain and nervous system, cells that transmit information via electrical and chemical signals.