The following summary table shows the number of space launches in the US by the type of launching agency and the outcome of the launch (success or failure).

(a) What variables were collected on each launch in order to create the summary table above?

(b) State whether each variable is numerical or categorical.

(c) Suppose we want to study how the success rate of launches vary between launching agencies and over time. In this analysis, which variable would be the response variable and which variable would be the explanatory variable