What Physical and Chemical Processes Transform Lignite to Bituminous Coal

question 3

Multiple Choice

What physical and chemical processes transform lignite to bituminous coal?

• A) coking in industrial ovens without oxygen
• B) mining it then drying it in the sun
• C) weathering and further transport
• D) heating to crack off water and volatile gases and pressure for compaction

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Definitions:

T-Distribution

A probability distribution that arises when estimating the mean of a normally distributed population in situations where the sample size is small and the standard deviation is unknown.

Student T-Distributed

Pertaining to a probability distribution that arises when estimating the mean of a normally distributed population in situations where the sample size is small and population standard deviation is unknown.

Sampled Population

The subset of a larger population that is selected for the purpose of a scientific study or statistical analysis.

Degrees Of Freedom

A concept in statistics referring to the number of independent values or quantities which can vary in the computation of a statistic, often related to the number of observations in a sample minus the number of restrictions or parameters.