Questions from Business Statistics

Q: The residual plot of Exercise 17 calls out some countries that have

The residual plot of Exercise 17 calls out some countries that have particularly large negative residuals. They are Gabon, Swaziland, Botswana, Namibia, and South Africa. What do these countries have...

Q: Here the residual plot corresponding to the regression model of Exercise 18

Here the residual plot corresponding to the regression model of Exercise 18 : The extreme case this time is Weight Watchers Pepperoni (makes sense, doesn’t it?). We can make one more...

Q: HIV One ongoing health problem in the part of Africa encompassing the

HIV One ongoing health problem in the part of Africa encompassing the outlying countries for the regression model of Exercise 17 is HIV/AIDS. Could that explain these outliers? Here another model, now...

Q: A regression model for data on breakfast cereals originally looked like this

A regression model for data on breakfast cereals originally looked like this: Dependent variable is: Calories R squared =84.5% R-squared (adjusted)=83.4% s=7.947 with 776=71 degrees of freedom Let&ac...

Q: An experiment to determine the effect of several methods of preparing cultures

An experiment to determine the effect of several methods of preparing cultures for use in commercial yogurt was conducted by a food science research group. Three batches of yogurt were prepared using...

Q: Particulate matter is a serious form of air pollution often arising from

Particulate matter is a serious form of air pollution often arising from industrial production. One way to reduce the pollution is to put a filter, or scrubber, at the end of the smokestack to trap th...

Q: A student wants to investigate the effects of real vs. substitute

A student wants to investigate the effects of real vs. substitute eggs on his favorite brownie recipe. He enlists the help of 10 friends and asks them to rank each of 8 batches on a scale from 1 to 10...

Q: In a statement to a Senate Public Works Committee, a senior

In a statement to a Senate Public Works Committee, a senior executive of Texaco, Inc., cited a study on the effectiveness of auto filters on reducing noise. Because of concerns about performance, two...

Q: A school district superintendent wants to test a new method of teaching

A school district superintendent wants to test a new method of teaching arithmetic in the fourth grade at his 15 schools. He plans to select 8 students from each school to take part in the experiment,...

Q: A biology student is studying the effect of 10 different fertilizers on

A biology student is studying the effect of 10 different fertilizers on the growth of mung bean sprouts. She sprouts 12 beans in each of 10 different petri dishes, and adds the same amount of fertiliz...