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In a controlled laboratory environment, independent random samples of 10 adults and 10 children were tested...

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Statistics

In a controlled laboratory environment, independent randomsamples of 10 adults and 10 children were tested by a psychologistto determine the room temperature that each person finds mostcomfortable. The study provided the following results:

  Adults     Children

Sample size    10 10

Sample mean (in degrees)  77.5             74.5

Sample variance 4.5    2.5

Which one of the following is the correct 99% confidenceinterval for the true difference in population mean temperaturesthat adults and children find most comfortable?

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