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Test whether there is difference between two population mean.

Paramedics in a large city say they need more staff at night because they get more emergency calls then.  A random sample of 7 nights showed that the paramedics received the following numbers of emergency calls during the night: 72, 81, 85, 80, 88 82, 56.  A sample of 7 different days showed that the paramedics received the following numbers of emergency calls during the day: 65, 54, 81, 67, 75, 83, 79.

1. State the random variables and means in words.
2. Use a 1 percent level of significance to test the claim that there are more calls during the night than in the day.

3. Find a 99% confidence interval for the difference in the mean number of calls between night and day.
4. State the assumptions for the test in terms of the problem.

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M921974

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