16. When preparing a representative sample from a list of 200 customers who comp
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16. When preparing a representative sample from a list of 200 customers who complained about errors in their statements, amight select any 20 customers. b stratified sample e. random sample d. comprehensive sample 17. In data and process modeling, an)model shows what the system must do, regardless of how in will be a. operational b. physical e. logical d. relational 8 A DFD shows a. how data are related b. what key fields are stored in the system e. how a system transforms input data into useful information d. what data is stored in the system 19. A spontaneous generation process is a process that has no input at least one output and one input, but the output obviously is insufficient to generate the input shown no output at least one input and one output, but the input obviously is insufficient to generate the output shown a. b. c. d. 20. A black hole is a process that has a no input b. at least one output and one input, but the output obviously is insufficient to generate the input shown no output at least one input and one output, but the input obviously is insufficient to generate the output shown c. d. 21. A gray hole is a process that has no input at least one output and one input, but the output obviously is insufficient to generate the input shown no output at least one input and one output, but the input obviously is insufficient to generate the output shown a. b. c. d. 22. is/are logically impossible in a DFD because a process must act on input, shown by an incoming data flow, and produce output, represented by an outgoing data flow a. Spontaneous combustion b. Gray matter c. Black holes d. Black boxes Systems Analysis and Design; Exam 3-Chapters 4,5,7, & 8, Spring 2018,SinclairExplanation / Answer
16. When preparing a representative sample from a list of 200 customers who complained about errors in their statements, a c. random sample might select any 20 customers.
According to the question the requirement is selecting any 20 people from the list of 200 customers, thus random sampling can be used.
17. In data and processing modeling, a c. logical model shows what the system must do, regardless of hos it will be implemented physically.
This is what a logical model means as, it results in what the system must do and not something like how it should be implemented physically.
18. A DFD shows:
c. how a system transforms input data into useful information.
A DFD relates to the Data Flow in the system and relates to how the data flows from input to output and how that leads to the useful information.
19. A spontaneous generation process is a process that has:
a. no input
A spontaneous generation process has no input and a black hole has no output. Thu the above and below questions response.
20. A black hole is a process that has:
c. no output
21. A gray hole is a process that has:
d. at least one input and one output, but the input obviously is insufficient to generate the output shown
22. c. Black holes is/are logically impossible in a DFD because a process must act on input, shown by an incoming data flow, and produce output, represented by an outgoing data flow.
Black hole are logically impossible in the Data Flow Diagrams
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