What's the difference between the logical and physical structure of a file? What are the advantages of not having an application program interact directly with the physical file structure?
A file's logical structure is composed of records and fields organized so that access by a program is as easy as possible. A file's physical structure depends on the method of physical storage allocation and the physical characteristics of devices containing the file. The two rarely match, so translation between them is necessary.Application programs are simplified because of their lack of interaction with the physical file structure. They need no knowledge of storage allocation issues and no programming that depends on them.
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Speculative risk
A) exists whenever there is the potential for both gain and loss. B) exists whenever there is only the possibility of loss. C) exists only in financial markets. D) exists only in gambling.
In order to test the significance of a multiple regression model involving 4 explanatory variables and 40 observations, the numerator and denominator degrees of freedom for the critical value of F are 4 and 35, respectively
a. True b. False Indicate whether the statement is true or false
In multiple regression analysis, the general linear model
a. can not be used to accommodate curvilinear relationships between dependent variables and independent variables b. can be used to accommodate curvilinear relationships between the independent variables and dependent variable c. must contain more than 2 independent variables d. None of these alternatives is correct.
The Nuclear Regulatory Commission (NRC) files a complaint against Energy Plant Corporation. The firm may want to settle the dispute, before formal adjudicatory proceedings begin, to avoid?
A. ?appearing uncooperative. B. ?eliminating the need for additional proceedings. C. ?rectifying the problem to the NRC's satisfaction. D. ?saving the expense of formal proceedings and later appeals.