Questions from Business Statistics

Q: Based on the analysis of marriage ages given in Exercise 33,

Based on the analysis of marriage ages given in Exercise 33, find a 95% confidence interval for the rate at which the age gap is closing. Explain what your confidence interval means

Q: Biologists studying the effects of acid rain on wildlife collected data from

Biologists studying the effects of acid rain on wildlife collected data from 172 streams in the Adirondack Mountains. They recorded the pH (acidity) of the water and the BCI, a measure of biological d...

Q: The price of a car depends on its age as well as

The price of a car depends on its age as well as on its mileage. Here is a regression in which the age of the cars (in years) is included in the regression model from Exercise 34: Response variable is...

Q: A consumer organization has reported test data for 50 car models.

A consumer organization has reported test data for 50 car models. We will examine the association between the weight of the car (in thousands of pounds) and the fuel efficiency (in miles per gallon)....

Q: Data collected from around the globe (including the sea ice data

Data collected from around the globe (including the sea ice data of Exercise 23) show that the earth is getting warmer. The generally accepted explanation relates climate change to an increase in atmo...

Q: In an effort to reduce the number of gun-related homicides

In an effort to reduce the number of gun-related homicides, some cities have run buyback programs in which the police offer cash (often $50) to anyone who turns in an operating handgun. Chance magazin...

Q: Consider again the data in Exercise 40 about the gas mileage and

Consider again the data in Exercise 40 about the gas mileage and weights of cars. 1. Create a 95% confidence interval for the slope of the regression line. 2. Explain in this context what your confide...

Q: Consider the CO2 and global temperature data of Exercise 41.

Consider the CO2 and global temperature data of Exercise 41. 1. Find a 90% confidence interval for the slope of the true line describing the association between Temp and CO2. 2. Explain in this contex...

Q: Consider again the data in Exercise 40 about the gas mileage and

Consider again the data in Exercise 40 about the gas mileage and weights of cars. 1. Create a 95% confidence interval for the average fuel efficiency among cars weighing 2500 pounds, and explain what...

Q: Consider once again the CO2 and global temperature data of Exercise 41

Consider once again the CO2 and global temperature data of Exercise 41. The mean CO2 level for these data is 352.566 ppm. 1. Find a 90% confidence interval for the mean global temperature anomaly if t...