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:

Monocytes

A type of white blood cell that plays a role in the immune system by fighting infections and helping other white blood cells remove dead or damaged tissues, destroy cancer cells, and regulate immunity against foreign substances.

Macrophages

A type of white blood cell that engulfs and digests cellular debris, foreign substances, and pathogens.

Body Defense Mechanism

The biological structures and processes within an organism that protect against disease by identifying and killing pathogens and tumor cells.

Pathogen

An organism such as a bacteria, virus, fungus, or parasite that can cause disease in its host.