Questions from Business Statistics

Q: In Chapter 6, Exercise 41 we examined We can examine the

In Chapter 6, Exercise 41 we examined We can examine the relationship between the fuel economy (Combined MPG) and Displacement (in liters) for 1211 models of cars. (Data in Fuel economy 2016) Further...

Q: Exercise 15 describes a regression model that estimates a cereal potassium content

Exercise 15 describes a regression model that estimates a cereal potassium content from the amount of fiber it contains. In this context, what does it mean to say that a cereal has a negative residual...

Q: The data set Igf13 contains the data from Igf for children under

The data set Igf13 contains the data from Igf for children under 13 years old. Most of the data was collected from physical examinations in schools. 1. Fit a linear regression to igÆ’ using age as the...

Q: Here are several scatterplots. The calculated correlations are 0.977

Here are several scatterplots. The calculated correlations are 0.977,0.021,0.736, and 0.951. Which is which?

Q: Exercise 16 describes a regression model that uses a car engine displacement

Exercise 16 describes a regression model that uses a car engine displacement to estimate its fuel economy. In this context, what does it mean to say that a certain car has a positive residual?

Q: In Exercise 15, the regression model Potassium^=38+27

In Exercise 15, the regression model Potassium^=38+27 Fiber relates fiber (in grams) and potassium content (in milligrams) in servings of breakfast cereals. Explain what the slope means.

Q: In Exercise 16, the regression model Combined MPG=33.

In Exercise 16, the regression model Combined MPG=33.46 3.23 Displacement relates cars engine size to their fuel economy (Combined mpg). Explain what the slope means.

Q: The correlation between a cereal fiber and potassium contents is r=

The correlation between a cereal fiber and potassium contents is r=0.903. What fraction of the variability in potassium is accounted for by the amount of fiber that servings contain?

Q: The correlation between a car engine size and its fuel economy (

The correlation between a car engine size and its fuel economy (in mpg) is r=0.774. What fraction of the variability in fuel economy is accounted for by the engine size?

Q: For Exercise 15 regression model predicting potassium content (in milligrams)

For Exercise 15 regression model predicting potassium content (in milligrams) from the amount of fiber (in grams) in breakfast cereals, se=30.77. Explain in this context what that means.