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An internet supplier of refilled ink cartridges for ink jet printers sold cartridges to 30,000 customers over the past two months. A random sample of 1000 of those customers revealed that 18% were not happy with their purchase. The margin of error was 2%. What range is likely to contain the population parameter?


29,000 to 31,000

14% to 22%

16% to 20%

480 to 600

  • statistics -

    .18 + or - .02 = range likely to contain population parameter

    .18 + .02 = .20
    .18 - .02 = .16

    16% to 20% -->converting decimals to percents

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