CH15(answers) - Ch 15 Name TRUE/FALSE Write'T if the...

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Ch 15 Name___________________________________ TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 1) Coded data require less time to enter and reduce the number of items entered. 1) 2) A sequence code eliminates the possibility of assigning the same number. 2) 3) A random number should be used when order of processing requires knowledge of the sequence in which items enter the system or the order in which events unfold. 3) 4) Coding affords the ability to distinguish between classes of items. 4) 5) To be useful, classes must be mutually inclusive. 5) 6) Classification codes should be listed in manuals or posted so that users can locate them easily. 6) 7) Only systems analysts need to know the cipher codes by heart. 7) 8) One reason for revealing information through codes is to make the data entry more meaningful. 8) 9) Any code that helps the data - entry person remember how to enter the data or the end - user remember how to use the information can be considered an alphabetic derivation code. 9) 10) Unicode is used to represent glyphs or syllables or whole words. 10) 11) Spelling out precisely what activities are to be accomplished is replaced by the use of a cipher code. 11) 12) If codes must be long, they should be broken up into subcodes. 12) 13) The code abbreviations in a mnemonic system must be frequently changed. 13) 14) Numerical codes are much easier to sort than alphanumerics. 14) 15) Keep codes uniform among, as well as within, programs. 15) 16) Use of a batch, real - time system that captures customer data without necessitating filling out a form is an excellent example of saving steps in data entry. 16) 17) When using codes in a GUI interface, they should be selected using a check box. 17) 18) If codes change frequently or are somewhat unstable, they should be stored as a database function in a GUI system. 18) 19) The increased speed of optical character recognition comes from not having to encode or key data from source documents. 19) 1
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20) Bar codes encode text, graphics, and data into small rectangular dots on a narrow strip of paper. 20) 21) Radio frequency identification allows the automatic collection of data using RFID tags or transponders that contain a chip and an antenna.. 21) 22) Active RFID tags are much less reliable because they depend on their own power supply, which may fail. 22) 23) The analyst must assume that errors in the data will not occur. 23) 24) A test for range or reasonableness works if there are only a few valid values, and it is feasible for situations in which values are not restricted and predictable. 24) 25) The Luhn formula is designed to catch every transposition error. 25) 26) Credit card processing uses a check digit formula called the Luhn formula. 26) 27) A pattern that contains symbols representing the type of data that must be present in a field is called a character map.
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