60 patients are in each group. The sample mean ICU stay days and sample standard deviation for the treatment an control group were 19.9 and 39.1 respectively, whereas these values for the control group were 13.7 and 15.8.
a. Calculate a point estimate for the difference between true average ICU stay for te treatment and control groups. Does this estimate uggest that there is a signiciant difference between true average stays under the two conditions?
b. Answer the question posed in part (a) by carrying out a formal test of hypotheses. Is the result different from what you conjectured in part (a)?
c. Is it normally distributed?