Cepheid Variables Are Useful in Measuring the Distance to ____

question 2

Multiple Choice

Cepheid variables are useful in measuring the distance to ____.

• A) globular clusters and dwarf galaxies around the Milky way, but nothing farther
• B) globular clusters and the Andromeda Galaxy, but not more distant objects
• C) galaxies that are within 30 megaparsecs, a relatively short distance
• D) galaxies that are moderately far away, up to about 500 megaparsecs
• E) galaxies and galactic clusters within a gigaparsec of the Milky Way

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Definitions:

Interval Variables

Another term for interval data, indicating variables measured along a scale on which each point is placed at equal distance from one another, with meaningful quantifiable differences but without a true zero.

Spearman Correlation

A measure of rank correlation, independent of parametric assumptions, which determines how accurately a monotonic function can depict the relationship between two variables.

Sample Statistic

A numerical measurement describing some aspect of a sample taken from a population.

Gross Revenue

The total amount of revenue generated by a business before deductions for expenses are made.