Which Statement About Extrasolar Planets Found to Date Is True

question 27

Multiple Choice

Which statement about extrasolar planets found to date is true?

• A) All lie more than 2 AU from their star.
• B) Some are so close to their stars that their periods are just a few days.
• C) Few are found by Doppler shifts of their stars, due to their gravity.
• D) Most have orbital periods of more than a year.
• E) All are terrestrials, comparable in size to Earth.

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Definitions:

F-test

A statistical test used to compare the variances of two populations and is based on the F-distribution.

One-tailed Test

A statistical hypothesis test in which the region of rejection is on only one side of the sampling distribution.

Population Variances

The squared deviation of a set of values in a population from their mean, representing the dispersion within the population.

Equality

A concept referring to the state or quality of being equal, indicating that two or more entities are the same in quantity, size, degree, or value.