Which One of These Occurrences Has NOT Been Observed as Evidence

question 6

Multiple Choice

Which one of these occurrences has NOT been observed as evidence of colliding galaxies?

• A) very strong X-ray emission coming from rich clusters of galaxies
• B) starburst galaxies that contain hot gas, many newborn stars, and relatively young globular clusters
• C) streams of hydrogen gas connecting two or more galaxies
• D) distribution of black hole candidates throughout a galaxy suggesting many star mergers as a result of a galactic collision

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Definitions:

Independent Samples

Two or more groups of data that are collected from different populations or treatment conditions, with no overlapping members between groups.

Parametric One-way Analysis

A statistical technique used for comparing means of three or more samples, assuming a normal distribution.

Kruskal-Wallis Test

A non-parametric method for testing whether samples originate from the same distribution, used as an alternative to the one-way ANOVA when the distribution assumption is violated.

F-test

A statistical test used to compare two variances and determine if they come from populations with equal variances.