Questions from Applied Statistics

Q: In the following regression, X = monthly maintenance spending (dollars

In the following regression, X = monthly maintenance spending (dollars), Y = monthly machine downtime (hours), and n = 15 copy machines. (a) Write the fitted regression equation. (b) State the degrees...

Q: In the following regression, X = total assets ($ billions),

In the following regression, X = total assets ($ billions), Y = total revenue ($ billions), and n = 64 large banks. (a) Write the fitted regression equation. (b) State the degrees of freedom for a two...

Q: Do stock prices of competing companies move together? Below are daily

Do stock prices of competing companies move together? Below are daily closing prices of two computer services firms (IBM = International Business Machines Corporation, HPQ = Hewlett- Packard Company....

Q: Below are percentages for annual sales growth and net sales attributed to

Below are percentages for annual sales growth and net sales attributed to loyalty card usage at 74 Noodles & Company restaurants. (a) Make a scatter plot. (b) Find the correlation coefficient and...

Q: Below are fertility rates (average children born per woman) in

Below are fertility rates (average children born per woman) in 15 EU nations for 2 years. (a) Make a scatter plot. (b) Find the correlation coefficient and interpret it. (c) Test the correlation coeff...

Q: Consider the following Excel regression of perceived sound quality as a function

Consider the following Excel regression of perceived sound quality as a function of price for 27 stereo speakers. (a) Is the coefficient of Price significantly different from zero at α =...

Q: Choose one of these three data sets. (a) Make

Choose one of these three data sets. (a) Make a scatter plot. (b) Let Excel estimate the regression line, with fitted equation and R2. (c) Describe the fit of the regression. (d) Write the fitted regr...

Q: Simple regression was employed to establish the effects of childhood exposure to

Simple regression was employed to establish the effects of childhood exposure to lead. The effective sample size was about 122 subjects. The independent variable was the level of dentin lead (parts pe...

Q: Two manufacturing facilities produce 1280 × 1024 LED (light-emitting

Two manufacturing facilities produce 1280 × 1024 LED (light-emitting diode) displays. Twelve shipments are tested at random from each lab, and the number of bad pixels per billion is note...

Q: (a) Interpret the slope of the fitted regression HomePrice =

(a) Interpret the slope of the fitted regression HomePrice = 125,000 + 150 SquareFeet. (b) What is the prediction for HomePrice if SquareFeet = 2,000? (c) Would the intercept be meaningful if this reg...