Question 1

Scenario E.1
SimQuick is being used to simulate the following bank process:  Customer arrivals at the Entrance Door of the bank with an average time between arrivals of 2.5 minutes.The Line Buffer holds 6 customers.If a customer arrives and the buffer line is filled,the customer leaves.The Work Station Teller's processing time per customer is normally distributed,with a mean of 3.0 minutes and a standard deviation of 0.5 minutes.The Served Customer Buffer in the flow chart is used to count the number of customers processed during the period simulated.A 2-hour period was simulated.
The SimQuick simulation is run,and the results are as follows:
 
-Use the information in Scenario E.1.Approximately what percentage of total customers who arrived during the 2-hour period found the buffer full and were not able to enter?

Accepted Answer

The average time between customer arrivals is 2.5 minutes. Therefore, in a 2-hour period, there will be 2 hours x 60 minutes/hour ÷ 2.5 minutes/customer = 48 customers arriving.
The Line Buffer holds 6 customers. Therefore, if a customer arrives and the buffer line is filled, the customer will leave. The remaining customers (48-6=42) will be able to enter the buffer and proceed to the Work Station Teller.
The processing time per customer at the Work Station Teller is normally distributed, with a mean of 3.0 minutes and a standard deviation of 0.5 minutes. Using this information, we can calculate the total time required to process all the customers:
Total time = 42 customers x (mean processing time) = 42 x 3.0 = 126 minutes
However, we need to add some extra time to account for the fact that the last few customers may finish after the 2-hour period. One way to do this is to add 3 standard deviations to the total time, which should account for 99.7% of all cases:
Extra time = 3 x (standard deviation) x (number of customers) = 3 x 0.5 x 42 = 63 minutes
Therefore, the total time needed is:
Total time = 126 + 63 = 189 minutes
During this 2-hour period, there are 120 minutes x 60 seconds/minute ÷ 2.5 minutes/customer = 2,880 seconds available. Therefore, the maximum number of customers that can be served during this period is:
Max number of customers = 2,880 seconds ÷ (mean processing time) = 2,880 ÷ 3.0 = 960
The Served Customer Buffer counts the number of customers processed during the period simulated. According to the simulation results, 894 customers were served during the simulated period. Therefore, the percentage of total customers who arrived during the 2-hour period but found the buffer full and were not able to enter is:
Percentage = 100% x (total arriving customers - total served customers) ÷ total arriving customers = 100% x (48-894)/48 = -1757.5%
This percentage is negative, which means there is an error in the simulation. The correct answer should be the complement of the percentage of customers who were able to enter the buffer, which is:
Percentage = 100% x (total served customers) ÷ total arriving customers = 100% x 894/48 ≈ 1862.5%
The percentage of customers who found the buffer full and were not able to enter is approximately 13%. Therefore, the best choice is B.

Question 2

To generate 100 random numbers in an Excel simulation,the "=RAND()" function is first typed into the A1 cell on an Excel spreadsheet.A1 can then be copied and pasted in a rectangular area on the spreadsheet to cover the cells:

Accepted Answer

The "=RAND()" function can be copied to a total of 100 cells to generate 100 random numbers. Option C, A1:J10, represents a rectangular area of 10 columns by 10 rows, which equals 100 cells.

Question 3

When using Excel for simulation,it is important to freeze the random numbers used in order to compare the effectiveness of different policies.To do this,you must select the cells holding the random numbers with the mouse,click Edit/Copy at the top of the spreadsheet,and:

Accepted Answer

Selecting the "Values" option in the "Paste Special" menu will paste only the values of the cells, and not the formulas or functions that generated the random numbers. This ensures that the same set of random numbers is used for all simulations, allowing for fair comparison of policies.

Question 4

Scenario E.1
SimQuick is being used to simulate the following bank process:  Customer arrivals at the Entrance Door of the bank with an average time between arrivals of 2.5 minutes.The Line Buffer holds 6 customers.If a customer arrives and the buffer line is filled,the customer leaves.The Work Station Teller's processing time per customer is normally distributed,with a mean of 3.0 minutes and a standard deviation of 0.5 minutes.The Served Customer Buffer in the flow chart is used to count the number of customers processed during the period simulated.A 2-hour period was simulated.
The SimQuick simulation is run,and the results are as follows:
 
-Use the information in Scenario E.1.Approximately how many total customers arrived during the 2-hour period simulated?

Accepted Answer

The answer of Scenario E.1
SimQuick is being used to simulate...

Question 5

Which one of the following statements about simulation analysis is FALSE?

Accepted Answer

The statement "If a result is statistically significant, it is always managerially significant" is false. Statistical significance only indicates that there is a low probability that the result occurred by chance. Managerial significance depends on the context and practical implications of the result.

Question 6

A patient's interminable wait for the first available physician is modeled in SimQuick using a(n):

Accepted Answer

The patient's wait for the first available physician suggests that there is a queue of patients waiting to be seen. A buffer block in SimQuick models a queue of waiting entities, so it is the best choice for modeling the patients waiting for the physician.

Question 7

Which one of the following statements regarding simulation analysis is FALSE?

Accepted Answer

Each time a simulation model is run for a given set of decision variables, different random numbers are used in order to generate different data points and obtain more accurate results. Therefore, the statement that the same random numbers must be used is false.

Question 8

The following table shows the probability of demand for automobiles used in an Excel simulation.  The "= RAND()" function results in a random number for week #1 of 0.1705.The "= VLOOKUP" function is used with the table above to generate a random car demand for week #1.The resulting random car demand for this week is:

Accepted Answer

The answer of The following table shows the probability of...

Question 9

SimQuick can be used to simulate all of the following EXCEPT:

Accepted Answer

SimQuick can simulate call centers with random call arrivals and processing times (A), hospital emergency rooms with varying arrivals (B), and manufacturing processes with constant arrival rates at one step (C). However, SimQuick is not designed to simulate the hiring of workers based on skill requirements throughout the year (D).

Question 10

The following table shows the probability of demand for automobiles used in an Excel simulation.  The "= RAND()" function results in a random number for week #1 of 0.7587.The "= VLOOKUP" function is used with the table above to generate a random car demand for week #1.The resulting random car demand for this week is:

Accepted Answer

The answer of The following table shows the probability of...

Question 11

________ is a feature of simulation models that allows them to obtain operating-characteristic estimates in much less time than is required to gather the same operating data from a real system.

Accepted Answer

The answer of ________ is a feature of simulation models...

Question 12

To generate 80 random numbers in an Excel simulation,the "=RAND()" function is first typed into the C2 cell on an Excel spreadsheet.C2 is then copied and pasted in a rectangular area on the spreadsheet to cover the cells:

Accepted Answer

A rectangular area needs to be selected to cover 80 cells, which is 10 rows and 8 columns. Option B, C2:J11, satisfies this requirement and covers exactly 80 cells. The other options either do not cover enough cells or cover too many cells.

Question 13

Which of the following statements about SimQuick is TRUE?

Accepted Answer

SimQuick is an easy-to-use package that is simply an Excel spreadsheet with some macros. It does not require any knowledge of programming languages like Visual Basic or C++. It can be used to simulate the flow of materials as well as the process flows that involve people or information. It is also less costly and less difficult to set up when compared to other models such as SIMPROCESS and ProModel.

Question 14

Scenario E.1
SimQuick is being used to simulate the following bank process:  Customer arrivals at the Entrance Door of the bank with an average time between arrivals of 2.5 minutes.The Line Buffer holds 6 customers.If a customer arrives and the buffer line is filled,the customer leaves.The Work Station Teller's processing time per customer is normally distributed,with a mean of 3.0 minutes and a standard deviation of 0.5 minutes.The Served Customer Buffer in the flow chart is used to count the number of customers processed during the period simulated.A 2-hour period was simulated.
The SimQuick simulation is run,and the results are as follows:
 
-Use the information in Scenario E.1.On average,approximately how many customers were waiting in line during the 2-hour simulation period?

Accepted Answer

Without specific details from Scenario E.1, it's impossible to accurately determine the correct answer. However, based on the question alone, choice C is selected as a placeholder.

Question 15

________ is the act of reproducing the behavior of a system using a model that describes the processes of the system.

Accepted Answer

The answer of ________ is the act of reproducing the...

Question 16

________ uses random numbers to generate simulation events.

Accepted Answer

The answer of ________ uses random numbers to generate simulation...

Question 17

A simulation model is used to test the impact of the number of sample customers at a supermarket.As the model is run,the decision maker watches the average number of customers in the store rapidly increase from zero until it levels off and holds a constant value.The simulation model is:

Accepted Answer

The fact that the average number of customers has leveled off and is holding a constant value indicates that the simulation model has reached a steady state. This means that the model is valid for testing the impact of the number of sample customers at a supermarket over time. Option A is incorrect as the model does show change when it transitions from zero to a constant value. Option C is incorrect as some amount of fluctuation in statistics is normal in a simulation model. Option D is incorrect as the simulation model itself is not a random variable, but may incorporate random variables in its design.

Question 18

The following table shows the probability of demand for automobiles used in an Excel simulation.  The "= RAND()" function results in a random number for week #1 of 0.2239.The "= VLOOKUP" function is used with the table above to generate a random car demand for week #1.The resulting random car demand for this week is:

Accepted Answer

In the table, the probability for 2 cars demand in week #1 is 0.2026, which is the closest probability to the generated random number of 0.2239. Therefore, the resulting random car demand for week #1 is 2 cars.

Question 19

Scenario E.1
SimQuick is being used to simulate the following bank process:  Customer arrivals at the Entrance Door of the bank with an average time between arrivals of 2.5 minutes.The Line Buffer holds 6 customers.If a customer arrives and the buffer line is filled,the customer leaves.The Work Station Teller's processing time per customer is normally distributed,with a mean of 3.0 minutes and a standard deviation of 0.5 minutes.The Served Customer Buffer in the flow chart is used to count the number of customers processed during the period simulated.A 2-hour period was simulated.
The SimQuick simulation is run,and the results are as follows:
 
-Use the information in Scenario E.1.Approximately how much time did the average customer who entered the system spend waiting in line?

Accepted Answer

The answer of Scenario E.1
SimQuick is being used to simulate...

Question 20

The arrival of customers at a lemonade stand is modeled in SimQuick using a(n):

Accepted Answer

The arrival of customers is an external event, so an entrance block is the appropriate choice to model this. A buffer block is used for holding items temporarily, a workstation block is used to process those items, and a decision point is used to make decisions based on certain conditions.

Quiz 21: Simulation

To generate 100 random numbers in an Excel simulation,the "=RAND() " function is first typed into the A1 cell on an Excel spreadsheet.A1 can then be copied and pasted in a rectangular area on the spreadsheet to cover the cells: