For Exercises 2.1 and 2.2, pages 64–65; for 2.3 and 2.4, see page 65; for 2.5 and 2.6, pages 66–67; and for 2.7, see page 68.

Question 2.16

2.16 Sales and time spent on web pages

You have collected data on 1000 customers who visited the web pages of your company last week. For each customer, you recorded the time spent on your pages and the total amount of their purchases during the visit. You want to explore the relationship between these two variables.

  1. What is the explanatory variable? What is the response variable? Explain your answers.
  2. Are these variables categorical or quantitative?
  3. Do you expect a positive or negative association between these variables? Why?
  4. How strong do you expect the relationship to be? Give reasons for your answer.