Examlex
Airlines often separate their customers into business travelers and personal travelers by giving a discount to those travelers who stay over a Saturday night.
Correlate
To have a mutual relationship or connection, where one thing affects or depends on another.
Large
Of considerable or relatively great size, extent, capacity, or quantity.
Randomly Chosen Groups
Groups formed without any predetermined pattern, often used in experimental designs to ensure objectivity.
Confounding Variable
An external factor in a study that could influence or mix up the results, making it hard to draw clear conclusions.
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