The manager of documentation for a. computer software firm wants to forecast the time required to document moderate-size computer programs. Records are available for 26 programs. The variables are y = number of writer-days needed, x1 = number of subprograms, x2 = average number of lines per subprogram, x3 = x1x2, and A portion of the output from a regression analysis of the data is shown here.
Multiple Regression Analysis
a. Write the multiple regression model and locate the residual standard deviation.
b. Does x3 have a significant, unique predictive value?
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