Examlex
The chemical compound whose formula is Na2S has the chemical name sodium sulfate.
Amount of Time
Refers to the duration or length of a specific interval or period measured in units such as seconds, minutes, hours, or years.
Studying on Weeknights
Refers to the activity of engaging in academic or educational work during evenings of the weekdays.
Independent Sample
Refers to two or more groups of samples that are selected from populations that do not have any kind of relationship.
Life Expectancy
An estimate of the average number of years an individual or organism can expect to live, given current mortality conditions.
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