In the article A Multifactorial Intervention Program Reduces the Duration of Delirium, Length of Hospitalization, and Mortality

Question:

In the article "A Multifactorial Intervention Program Reduces the Duration of Delirium, Length of Hospitalization, and Mortality in Delirious Patients" (Journal of the American Geriatrics Society, Vol. 53, No. 4, pp. 622-628), M. Lundstrom et al. investigated whether education programs for nurses improve the outcomes for their older patients. The standard deviation of the lengths of hospital stay on the intervention ward is 8.3 days.
a. For the variable "length of hospital stay," determine the sampling of the sample mean for samples of 80 patients on the intervention ward.
b. The of the length of hospital stay is right skewed.
Does this invalidate your result in part (a)? Explain your answer.
c. Obtain the probability that the sampling error made in estimating the population mean length of stay on the intervention ward by the mean length of stay of a sample of 80 patients will be at most 2 days. Distribution
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