Emily's main goal here was to test whether or not the tt practicioners' guesses were random, like the flip of a coin. in most medical experiments, this is the norm. we want to test whether or not the treatment has an effect, not whether or not the treatment actually works. we will now begin to formulate this experiment in terms of the terminology we learned in this course. question 1: describe emily’s model for how likely the tt practitioners are to choose the correct hand. what alternative model is her model meant to discredit? discuss with students around you to come to a conclusion. check in with a ta or la if you are stuck.

Exercise: counting committees 0.0/2.0 puntos (calificable) we start with a pool of n people. a chaired committee consists of k≥1 members, out of whom one member is designated as the chairperson. the expression k(nk) can be interpreted as the number of possible chaired committees with k members. this is because we have (nk) choices for the k members, and once the members are chosen, there are then k choices for the chairperson. thus, c=∑k=1nk(nk) is the total number of possible chaired committees of any size. find the value of c (as a function of n ) by thinking about a different way of forming a chaired committee: first choose the chairperson, then choose the other members of the committee. the answer is of the form c=(α+nβ)2γn+δ. what are the values of α , β , γ , and δ ?