Task 10: In the course of one year, 15 patients were admitted to a hospital ward because of a certain infection. Most of these patients have since been discharged, but some are still on the ward. The following are the lengths of stay in days: 3, 5, 5, 6, 8, 8+, 10, 16, 20, 22+, 24, 25+, 26+, 28, 33. A + indicates patients who could not be discharged by the specified length of stay. a) If the calculation is done with the R-function surviit, the last 3 rows of the table are output as: time n.risk n.event survival std.err lower 95% Cl upper 95% CI 24 5 0.356 0.1325 0.1713 0.738 28 2 0.178 0.1421 0.0371 0.852 33 1 0.000 NaN NA NA Describe in words how to interpret the confidence limits. Based on these results, could it be ruled out with a statistically high degree of certainty that the median retention time could be longer than 28 days? b) Are there any anomalies regarding the confidence limits in task part c)? Which of the figures given there are questionable