A pharmaceutical company tested a new drug to be marketed for the treatment of a particular type of virus. In order to obtain an estimate on the mean recovery time, this drug was tested on 15 volunteer patients, and the recovery time (in days) was recorded. The following data were obtained.
8 17 10 6 34 11 13 6 9 8
19 4 12 17 7
(a) Obtain a 95% con?dence interval estimate of the mean recovery.
(b) What assumptions do we need to make? Test for these assumptions.