Regression analysis of computer software

Reference no: EM1395635

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 not complete 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:

Regression Statistics

Multiple R

R Square 0.7554

Adjusted R Square 0.7467

Standard Error

Observations 30.0000

ANOVA

df SS MS F Significance F

Regression 1 171062.9193 171062.9193 86.4759

Residual 1978.1582

Total 29 226451.3503

Coefficients Standard Error t Stat P-value Lower 95% Upper 95%

Intercept -95.0614 26.9183 -3.5315 0.0015 -150.2009 -39.9218

Download 3.7297 0.4011

1) Referring to Table 13-11, what is the standard deviation around the regression line?

2) Referring to Table 13-11, conduct t-test whether there is a linear relationship between revenue and the number of downloads? Use p-value and alpha =.05

3) Referring to Table 13-11, what are, respectively, the lower and upper limits of the 95% confidence interval estimate for population slope?

Reference no: EM1395635

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