In Moyer et al $[1],$ the frequency with which four different landing strategies for the

trailing leg during a slip were identified. These were minimal change in swing phase of

gait $($MIN$),$ foot flat landing $($FF$),$ forefoot landing $($MID$)$ and toe down landing $($TD$).$

Below is a sample of the data set from this study.

a$.$ How many trials does this data set include? $(2$ points$)$

b$.$ Define the sample space for strategy. $(2$ points$)$

c$.$ Explain why TD and MID are disjoint $(3$ points$).$

d$.$ Identify a set of independent categories $(2$ points$)$