help with this question please, what is df , SS, MS software quality engineer wa
ID: 3051534 • Letter: H
Question
help with this question please, what is df , SS, MS
software quality engineer wants to develop a regression model for predicting the number of faults in program (y). S/He decided that four software complexity metrics are potentially useful as independent variables, namely program size in lines of code in program (x) and excecutable lines of code (x2), program control flow measured in terms of the number of branches (ts) and the number of tokens in program (r4). Data were collected on a set of 24 programs from a distributed application in a data communication software system. The ANOVA table for the model yi = 0 + | xii +Baai + BsZgi + 4E4i + 6, was found to be as follows: 2. A Source of Variation df SS MS Model Error Total 4 5409.99 19 16.385 23 5426.34 (a) Test to determine whether a regression relation exists between y and the set of independent variables. Use a level of significance of 05. What do you find? (b) Does the conclusion that a regression relation exists imply that the software quality engineer need not screen the independent vari- ables and can just use them all? If a regression relation had not existed, what would this imply about screening the independent variables?Explanation / Answer
a) F=1803.3/0.8175=2205.87
F critical=3.10
as F> F critical
wecn say regression exists between y and independent varible
c)no regression relation exists does not mean that software engineer need not screen independent variable. we have to find weather interaction betwwen them exists or not.if regression equation had not existed then no need to screen independent varible.
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