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In a random sample of 700 teenagers, 448 admitted to using at least one informal element in school writing assignments. [Note: Emoticons, such as using
In a random sample of 700 teenagers, 448 admitted to using at least one informal element in school writing assignments. [Note: Emoticons, such as using the symbol ":)" to represent a smile, and abbreviations, such as writing "LOL" for "laughing out loud," are considered informal elements.] Do the data provide significant evidence, at the 3.7% level, that the proportion of US teenagers who have used at least one informal element in a school writing assignment is less than 0.65?
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