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    Confidence Intervals

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    A recent poll of 700 people who worked indoors found that 278 of them smoke. If the researchers want to be 98% confident of thier results to within 3.5 %, how large a sample is necessary.

    a. 1062
    b. 532
    c. 751
    d. 1301

    © BrainMass Inc. brainmass.com June 3, 2020, 9:19 pm ad1c9bdddf
    https://brainmass.com/statistics/confidence-interval/confidence-intervals-176735

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