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One senior administration official declined to answer, but pointed out that the president spoke Monday in the present tense, saying, I know how difficult it can be to break this habit, as opposed to I know how difficult it was to break this habit. As Mr

After collecting questionnaires from data collectors, the researchers ensured confidentiality by using anonymous surveys

Our estimated conversion rate of 10 percent is extremely conservative, and higher conversion rates would result in much higher sales numbers

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The mean age of the participants was 46.0 years (SD=16.2)