One Important Way Astronomers Can Learn in Some Detail About

question 25

Multiple Choice

One important way astronomers can learn in some detail about what happens when galaxies collide is

• A) to watch the Andromeda Galaxy (M31,) which is on a collision course with us, for a decade
• B) to look at the supermassive black hole at the center of the Milky Way
• C) to examine the satellite galaxies presently orbiting the Milky Way
• D) to simulate galaxy collisions on a large computer and watch what the simulation predicts
• E) to look at videos of car accidents that are particularly violent

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Definitions:

Independent-Samples T Test

A method of statistical analysis that compares the average values of two separate groups to see if their differences are statistically meaningful.

Dependent-Samples T Test

An analytical procedure aimed at comparing the averages of two connected groups to ascertain if the variance is statistically meaningful.

Well-Being

A general term for the condition of an individual or group, in terms of health, happiness, and prosperity.

Significance Level

The probability of rejecting the null hypothesis when it is actually true, used in hypothesis testing as a threshold for determining statistical significance.