In 1974 We Transmitted a Message Toward the Globular Cluster

question 3

Multiple Choice

In 1974 we transmitted a message toward the globular cluster M13 which is 21,000 ly away. What is one reason that this object was probably not ideal for sending a message to?

• A) it is so far away that we will probably have stopped communicating before we receive and return signal
• B) globular clusters contain young, high mass stars with insufficiently long main sequence lifetimes and hence are unsuitable places for life
• C) the message will be absorbed by interstellar dust before it reaches the cluster
• D) globular clusters contain, old, low mass stars with fewer heavy elements and hence are not ideal places for life

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Definitions:

Regression

A statistical method used to model and analyze relationships between variables.

Obtained Value

The actual value or result achieved in an experiment or study, typically used in statistical analysis to compare against theoretical values.

Critical Value

The threshold value that the test statistic must exceed in order for the null hypothesis to be rejected in a hypothesis test.

Significance Level

The threshold chosen by the researcher for rejecting the null hypothesis; commonly set at 0.05 or 5%.