As the outside temperature increases, it is likely that ice-cream sales would also increase. However, this likelihood doesn't mean that outside temperature changes cause ice-cream sales to increase. Another lurking variable, such as more ice-cream coupons available or longer store hours, may be causing the increase.

• Describe two variables that you think are associated. Describe the association.
• Describe a lurking variable and how it could influence the outcome of the association of the variables.
• Read this post.
• "Mouse and keyboard sales are influenced by the number of computer sales. To use a computer, you need to use a mouse and keyboard so people who buy computers will also buy mice and keyboards. A lurking variable in this situation would be whether the computer comes with a mouse and keyboard. When you buy a computer from a trustable company, a keyboard and mouse will come with the computer as a set."
  • Do you agree with the stated lurking variable and the influence on the outcome? Why or why not?
  • Provide an additional possible lurking variable.