For each of 100 days, a restaurant owner recorded the total revenue for the day along with the percent change in a stock market index fund. The owner would like to create a visual display to better identify if a relationship exists between the two variables. Which type of graphical display should be used?

A box plot is primarily used to display the distribution of a single quantitative variable, highlighting its median, quartiles, and potential outliers. It does not effectively illustrate relationships between two different variables, which is essential for the restaurant owner’s analysis of revenue versus stock market changes.

A stem-and-leaf plot provides a way to display quantitative data while preserving the original data values. However, it is mainly used for summarizing a single variable rather than examining the relationship between two variables, thus making it unsuitable for the restaurant owner's needs.

A histogram is utilized to display the frequency distribution of a single quantitative variable. While useful for understanding the distribution of daily revenue or percent changes separately, it does not reveal any potential correlation between the two variables, which is the owner’s aim.