Which of the Following Is NOT a Way in Which

question 59

Multiple Choice

Which of the following is NOT a way in which astronomers detect dark matter in clusters of galaxies?

• A) by determining the amount of mass necessary to gravitationally collapse clouds of gas to form the number of stars present
• B) by determining the amount of mass necessary to gravitationally hold onto the hot gas surrounding galaxy clusters
• C) by determining the amount of mass necessary to gravitationally hold a cluster of galaxies together
• D) by determining the amount of mass necessary to gravitationally lens images of distant objects
• E) None of the above; all of these are ways that astronomers detect dark matter in galaxy clusters.

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Definitions:

One-Way ANOVA

A statistical test that compares the means of three or more independent groups to determine if there is a significant difference between them.

Null Hypothesis

The default hypothesis that there is no significant difference or relationship between specified populations, any observed effect is due to sampling or experimental error.

Interaction

In the context of statistics and experimental design, interaction refers to a situation where the effect of one independent variable on the dependent variable varies according to the level of another independent variable.

Factorial ANOVA

A statistical test used to examine the effects of two or more independent variables on a dependent variable simultaneously.