What information should you consider to examine the external validity of the claim, Two thirds of American college students sleep less than six hours a day if the sample size is large enough if random assignment was used in the study if the study used probability sampling if the sample includes non American participants

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Question: What information should you consider to examine the external validity of the claim, Two-thirds of American college students sleep less than six hours a day?

What information should you consider to examine the external validity of the claim, "Two-thirds of American college students sleep less than six hours a day"?

if the sample size is large enough
if random assignment was used in the study
if the study used probability sampling
if the sample includes non-American participants

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