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29 November, 16:00

In a survey of 5100 randomly selected T. V. viewers, 40% said they watch network news programs. Find the margin of error for this survey if we want 95% confidence in our estimate of the percent of T. V. viewers who watch network news programs.

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  1. 29 November, 19:28
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    Margin of error = 0.01344

    Step-by-step explanation:

    Margin of error = critical value * standard deviation.

    critical value for 95% confidence interval = 1.96

    Standard deviation = √[ (p) (q) / n]

    p = 0.4, q = 1 - p = 1 - 0.4 = 0.6, n = 5100

    Standard deviation = √[ (0.6*0.4) / 5100] = 0.00686

    Margin of error = 1.96 * 0.00686 = 0.0134
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