Approximately How Many Planets Are Believed to Exist in Our

question 82

Multiple Choice

Approximately how many planets are believed to exist in our Galaxy?

• A) eight
• B) a few thousand
• C) around a million
• D) at least 100 billion

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Definitions:

Sample Variance

A statistical measure of the dispersion or variability within a sample dataset.

Populations

A complete set of individuals, items, or data from which a statistical sample can be drawn for a study.

Chi-square Value

A statistic used to measure how expectations compare to actual observed data, often used in hypothesis testing.

One-tailed Test

A statistical test in which the region of rejection is on only one side of the sampling distribution, used when testing a directional hypothesis.