Thirty patients are selected from a filing cabinet

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47) Thirty patients are selected from a filing cabinet containing 812 patient folders by choosing every 27th patient folder.  Which sampling method is this?  A. Cluster sample B. Simple random sample C. Stratified sample D. Systematic sample 48) Suppose that the optimal values of the decision variables to a two-variable linear programming problem remain the  same as long as the slope of the objective function lies between the slopes of the following two constraints:     2 X 1 + 3 X 26     2 X 1 + 2 X 20  The current objective function is:     8 X 1 + 9 X 2 =  Z   Which of the following statements about the range of optimality on  c 1 is TRUE?  49) Which one of the following statements concerning production and staffing plans is best?  50) Which one of the following statements concerning production and staffing plans is best? 
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51) Queuing models use an A/B/C notation. What do these variables represent?  A. maximum time between arrivals/maximum allowable service time/maximum number of parallel servers B. distribution of time between arrivals/distribution of service times/number of parallel servers C. average time between arrivals/average service time/number of parallel servers D. minimum time between arrivals/minimum allowable service time/minimum number of parallel servers
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