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9. The administrators of a hospital wish to estimate the average number of days required for inpatient treatment of patients between the ages of 25 and 34. A random sample of 500 hospital patients between these ages produced a mean number of 5.4 days with a standard deviation of 3.4 days. Have the requirements for constructing a z-confidence interval for the mean been met? Mark all of the following requirements that have been met with yes, and a]1 the requirements that have not been met with no. (1 pt. each) [be sample is a simple random sample 111; population standard deviation is known. 11;; population from which the data are obtained is normally distributed, or the sample size is large enough. 11;; requirements for constructing a z-condence interval for a mean have been met