Difference in the mean number of calls

Reference no: EM1321467

Construct a 99% confidence interval for the difference in the two 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. Find a 99% confidence interval for the difference in the mean number of calls between night and day.

2. State the assumptions for the test in terms of the problem.

Reference no: EM1321467

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