What is the domain of the relation {(-10, 2), (0,2), (10,0), (10,2)? a. {-10,10} b. {2} c. {-10, 0, 10} d. {0, 2}

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .