Assume that these data are seven random observations taken from a larger population whose values are normally distributed. (even if this assumption makes little sense) Using this assumption, coupled with prior computations, estimate an interval that contains 95% of incubation time values in the population of HIV patients from which the sample was taken.
The seven random observations were 12.0 10.5 13.5 12.5 9.5 6.3 7.2