By Comparing Globular Clusters, You Find That Cluster A's RR

question 24

Multiple Choice

By comparing globular clusters, you find that Cluster A's RR Lyrae stars are 100 times fainter than Cluster B's RR Lyrae stars. You know that both clusters have approximately the same chemical composition and age, and thus their RR Lyrae stars should have the same luminosities. Which is true about the clusters' distances?

• A) Cluster A is 10 times farther away than Cluster B.
• B) Cluster A is 10 times closer to us than Cluster B.
• C) Clusters A and B are approximately the same distances from us.
• D) Cluster A is 100 times farther away than Cluster B.
• E) Cluster A is 100 times closer to us than Cluster B.

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Definitions:

Multiple Regression

A method in statistics that predicts how a dependent variable changes based on two or more independent variables.

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The pressure of circulating blood on the walls of blood vessels, often measured for health assessment.

Significance Level

A significance level is a threshold in hypothesis testing that determines the probability of rejecting the null hypothesis when it is actually true, often denoted by alpha.

Linearly Related

Describes two variables that change together at a constant rate, represented graphically as a straight line.