QMS 202 Final: QMS CRIB SHEET (FINAL).doc
1 May 2012
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The director of patient services of a large health maintenance organization wants to evaluate patient waiting time at a local facility. A random sample of 25 patients is selected from the appoint book. The waiting time is defined as the time from when the patient signs in to when he or she is seen by the doctor. The following data represents the waiting times (in minutes). x is known: Construct a 95% confidence interval estimate of the pop. avg. waiting time: state the necessary assumption(s)/condition(s) required to construct a 95% confidence interval estimate for the population average waiting time. It is not normally distributed (n is not equal or greater than. Apply clt no. because n = 25. Assume x is normally distributed: state the critical value needed to construct the 95% confidence interval estimate for the population average waiting time. t critical values = 2. 064 (calc: dist, t, invt, area: 0. 025, df:
