Examlex
The professor of a business statistics class wanted to find out the mean amount of time per week her students spent studying for the class.She divided the students into the left,right and center groups according to the location they sat in the class that day.One of these 3 groups was randomly selected and everyone in the group was asked the mean amount of time per week he/she spent studying for the class.This is an example of a cluster sample.
Chest Discomfort
A common symptom that can be caused by a wide range of conditions, from muscular strain to heart problems.
Electrocardiogram
A test that records the electrical activity of the heart to detect any heart problems.
Fluoride
A mineral used in dental care to strengthen tooth enamel and prevent cavities, often added to toothpaste, mouthwash, and some public water supplies.
Drinking Water
H2O that is safe and suitable for human consumption, free from contaminants and pathogens.
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