As Much as 90% of the Matter in the Universe

question 118

Multiple Choice

As much as 90% of the matter in the universe may be unseen "dark matter." Where is this dark matter?

• A) It seems to be rather uniformly distributed throughout the universe.
• B) It is concentrated in the centers of galaxies,and may,in fact,be related to black holes at galactic centers.
• C) It is concentrated in the planes of galaxies,but extends far beyond the visible galactic plane.
• D) It appears to be concentrated in spherical haloes around galaxies,but extends several times the radius of visible matter.

Identify scenarios of Type I and Type II errors.

Understand the definition and consequences of Type I and Type II errors, including their probabilities (α and β).

Recognize the importance of the null hypothesis and the conditions under which it can be rejected.

Grasp the concept of test statistic values' probability and interpret p-values in different hypothesis testing scenarios.

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Definitions:

Return Statement

A statement in programming languages used to exit a function and optionally pass back a value to the caller.

Invocation

The act of calling a method or a function in a program.

Void

A keyword used in programming to specify that a method does not return a value.

Mutator Methods

Methods that allow for changing the state of an object by modifying its instance variables.