An article reported that patients under care for HIV have CD4 tests every 3 months, on average. A…

An article reported that patients under
care for HIV have CD4 tests every 3 months, on average. A concern at Boston
Medical Center is that there is a longer lag between tests. To test the
concern, a random sample of 15 patients currently under care for HIV is
selected and the time between their two most recent CD4 tests is recorded. The
mean time between tests is 3.9 months with a standard deviation of 0.4 month.
Run the appropriate test at a 5% level of significance.

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