Which of the Following Processes Slowed the Collapse of Protogalactic

question 90

Multiple Choice

Which of the following processes slowed the collapse of protogalactic clouds?

• A)the radiating away of thermal energy
• B)the formation of the first generation of stars
• C)the shock waves from the exploding supernovae of the earliest stars
• D)the pull of gravity of the mass of the cloud material
• E)the conversion of gravitational potential energy into kinetic and thermal energy as the cloud collapsed

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Definitions:

T-statistic

A statistic calculated from sample data used to assess the plausibility of the null hypothesis in t-tests.

Standard Error

The typical deviation found in the distribution of sample statistics, often referring to the mean.

T-statistic

A type of statistic used in hypothesis testing, determined by the difference between the sample mean and the population mean divided by the standard error.

Degrees Of Freedom

The number of values in a final calculation of a statistic that are free to vary.