Questions from Business Statistics

Q: A study that examined the health risks of smoking measured the cholesterol

A study that examined the health risks of smoking measured the cholesterol levels of people who had smoked for at least 25 years and people of similar ages who had smoked for no more than 5 years and...

Q: What factor most explains differences in Fuel Efficiency among cars? Below

What factor most explains differences in Fuel Efficiency among cars? Below is a correlation matrix exploring that relationship for the car Weight (1000 lb), Horsepower, Displacement, and number of Cyl...

Q: Look again at the correlation table for cars in the previous exercise

Look again at the correlation table for cars in the previous exercise. 1. Which two variables in the table exhibit the strongest association? 2. Is that strong association necessarily cause-and-effect...

Q: Can we predict the Horsepower of the engine that manufacturers will put

Can we predict the Horsepower of the engine that manufacturers will put in a car by knowing the Weight of the car? Here are the regression analysis and residuals plot: Dependent variable is: Horsepowe...

Q: Consider a regression to predict the fuel efficiency (as miles per

Consider a regression to predict the fuel efficiency (as miles per gallon, MPG) of the cars in the Cars data file. Here is one regression model using the Weight and the Drive Ratio: Response variable...

Q: Here is a scatterplot of the residuals from the regression in Exercise

Here is a scatterplot of the residuals from the regression in Exercise R2.18: 1. Does the residual plot suggest that the regression conditions were satisfied? Explain. In the United States, fuel effic...

Q: Are good grades in high school associated with family togetherness? A

Are good grades in high school associated with family togetherness? A random sample of 142 high school students was asked how many meals per week their families ate together. Their responses produced...

Q: Although some women are colorblind, this condition is found primarily in

Although some women are colorblind, this condition is found primarily in men. Why is it wrong to say there a strong correlation between Sex and Colorblindness?

Q: There is evidence that eruptions of Old Faithful can best be predicted

There is evidence that eruptions of Old Faithful can best be predicted by knowing the duration of the previous eruption. 1. Describe what you see in the scatterplot of Intervals between eruptions vs....

Q: The ranges inhabited by the Indian gharial crocodile and the Australian saltwater

The ranges inhabited by the Indian gharial crocodile and the Australian saltwater crocodile overlap in Bangladesh. Suppose a very large crocodile skeleton is found there, and we wish to determine the...