Which of the following scenarios best illustrates the use of an independent samples t-test rather than a dependent (paired) samples t-test?

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Comparing the cholesterol levels of patients before and after a dietary intervention.

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Comparing the reaction times of participants under two different lighting conditions, measured in the same individuals.

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Comparing the weight of individuals measured in the morning and evening of the same day.

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Comparing the exam scores of students taught using two different teaching methods, with each student experiencing only one method.

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