Questions from Business Statistics

Q: An online clothing retailer keeps track of its customers purchases. For

An online clothing retailer keeps track of its customers purchases. For those customers who signed up for the company credit card, the company also has information on the customer Age and Income. A ra...

Q: For the online clothing retailer discussed in the previous problem, the

For the online clothing retailer discussed in the previous problem, the scatterplot of Total Yearly Purchases by Income looks like this: The correlation between Total Yearly Purchases and Income is 0....

Q: The SAT is a test often used as part of an application

The SAT is a test often used as part of an application to college. SAT scores are between 200 and 800, but have no units. Tests are given in both Math and Verbal areas. SAT-Math problems require the a...

Q: Colleges use SAT scores in the admissions process because they believe these

Colleges use SAT scores in the admissions process because they believe these scores provide some insight into how a high school student will perform at the college level. Suppose the entering freshmen...

Q: Suppose we wanted to use SAT math scores to estimate verbal scores

Suppose we wanted to use SAT math scores to estimate verbal scores based on the information in Exercise 53. 1. What is the correlation? 2. Write the equation of the line of regression predicting verba...

Q: Based on the statistics for college freshmen given in Exercise 54,

Based on the statistics for college freshmen given in Exercise 54, what SAT score would you predict for a freshmen who attained a first-semester GPA of 3.0?

Q: The National Interagency Fire Center (www.nifc.gov)

The National Interagency Fire Center (www.nifc.gov) reports statistics about wildfires. Here an analysis of the number of wildfires between 1985 and 2015. 1. Is a linear model appropriate for these da...

Q: A study compared the effectiveness of several antidepressants by examining the experiments

A study compared the effectiveness of several antidepressants by examining the experiments in which they had passed the FDA requirements. Each of those experiments compared the active drug with a plac...

Q: We saw in Exercise 57 that the number of fires was nearly

We saw in Exercise 57 that the number of fires was nearly constant. But has the damage they cause remained constant as well? Here a regression that examines the trend in Acres per Fire (in hundreds of...

Q: Carmax.com lists numerous Toyota Corollas for sale within a 250

Carmax.com lists numerous Toyota Corollas for sale within a 250 mile radius of Redlands, CA. The table lists the ages of the cars and the advertised prices. 1. Make a scatterplot for these data. 2. De...