Final answer:
Sanjay's collection of snowfall and rainfall amounts is an example of two variable data because he is examining the correlation between them. Hussein's data on the number of gold medals is one variable data, as it tracks only one quantity over time.
Step-by-step explanation:
In the first situation, Sanjay is collecting information about two different quantities: the amount of snowfall and the amount of rainfall. This involves two variable data because he is looking to see if there is a correlation between the two.
In contrast, Hussein is only collecting information on one quantity: the number of gold medals won by the school track and field team. Since there's only one variable involved, this is an example of one variable data.
Understanding whether data involves one variable or two is crucial when deciding the type of statistical analysis to perform. If we are investigating the relationship between two variables, we would use techniques such as scatter plots, correlation coefficients, and regression analysis to explore the nature of the relationship.