Questions from Business Statistics

Q: One can determine how old a tree is by counting its rings

One can determine how old a tree is by counting its rings, but that requires either cutting the tree down or extracting a sample from the tree core. Can we estimate the tree age simply from its diamet...

Q: A consumer organization wants to compare gas mileage figures for several models

A consumer organization wants to compare gas mileage figures for several models of cars made in the United States with autos manufactured in other countries. The data for a random sample of cars class...

Q: In the last exercise, you saw that the linear model had

In the last exercise, you saw that the linear model had some deficiencies. Let create a better model. 1. Perhaps the cross-sectional area of a tree would be a better predictor of its age. Since area i...

Q: An electronics website collects data on the size of new HD flat

An electronics website collects data on the size of new HD flat-panel televisions (measuring the diagonal of the screen in inches) to predict the cost (in hundreds of dollars). Which of these is most...

Q: The Child Trends Data Bank monitors issues related to children. The

The Child Trends Data Bank monitors issues related to children. The table shows a 50-state average of the percent of expectant mothers who smoked cigarettes during their pregnancies. 1. Create a scatt...

Q: The downward trend in smoking you saw in the last exercise is

The downward trend in smoking you saw in the last exercise is good news for the health of babies, but will it ever stop? 1. Explain why you can’t use the linear model you created in Exercise R2.26 to...

Q: It commonly believed that people use tips to reward good service.

It commonly believed that people use tips to reward good service. A researcher for the hospitality industry examined tips and ratings of service quality from 2645 dining parties at 21 different restau...

Q: Data from 50 large U.S. cities show the mean

Data from 50 large U.S. cities show the mean January Temperature and the Latitude. Describe what you see in the scatterplot.

Q: Here are the scatterplot and regression analysis for Case Prices of 36

Here are the scatterplot and regression analysis for Case Prices of 36 wines from vineyards in the Finger Lakes region of New York State and the Ages of the vineyards. (Data in Vineyards full) 1. Does...

Q: The study of U.S. cities in Exercise R2.

The study of U.S. cities in Exercise R2.29 found the mean January Temperature (degrees Fahrenheit), Altitude (feet above sea level), and Latitude (degrees north of the equator) for 55 cities. Here the...