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Problem

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question

In comparing the life expectancies of two models of refrigerators, the average years before complete breakdown of 10 model A refrigerators is compared with that of 15 model B refrigerators. The 90% confidence interval estimate of the difference is (6, 12). Which of the following is the most reasonable conclusion?

choices

  1. The mean life expectancy of one model is twice that of the other.
  2. The mean life expectancy of one model is 6 years, while the mean life expectancy of the other is 12 years.
  3. The probability that the life expectancies are different is 0.90.
  4. We should be 90% confident that the difference in life expectancies is between 6 and 12 years.

subject

high_school_statistics

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