TABLE 13-11 A Computer Software Developer Would Like to Use the Number

question 146

Short Answer

TABLE 13-11
A computer software developer would like to use the number of downloads (in thousands) for the trial version of his new shareware to predict the amount of revenue (in thousands of dollars) he can make on the full version of the new shareware. Following is the output from a simple linear regression along with the residual plot and normal probability plot obtained from a data set of 30 different sharewares that he has developed:



-Referring to Table 13-11, what is the critical value for testing whether there is a linear relationship between revenue and the number of downloads at a 5% level of significance?

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Definitions:

Superego

Within the framework of psychoanalytic theory, it is the component of the personality that serves as the ethical core, mandating adherence to moral behavior and the norms of society.

Id

A component of the human psyche, based on Freudian psychology, that is responsible for unconscious desires and impulses.

Ego

In psychoanalytic theory, the part of the personality that mediates between external reality and inner demands of the id and superego.

Correlation Coefficient

A number ranging from -1.00 to +1.00 that expresses the direction (positive or negative) and strength of the relationship between two variables.