Choose the equation that could be used to find two consecutive integers whose sum is 69.

n + (n + 2) = 69

n + (n + 1) = 69

n − (n + 1) = 69

n + 2n = 69

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 .