A researcher is interested in the effects of chocolate on cognitive performance. In the study, participants were instructed to eat either zero bars of chocolate or two bars of chocolate. Then, to measure cognitive performance, participants engaged in both a speeded-reaction-time task and a cognitive control task, both of which were designed to measure the same construct (i. e., cognitive performance). How many independent variables did the researcher manipulate? Group of answer choices 1

What is the perimeter of square abcd? units units 28 units 37 units

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

Gexpressions: practice question 3 of 5 jackson wants to study the popularity of his music video by tracking the number of views the video gets on his website. the expression below represents the total number of views that jackson's video receives n days after he begins tracking the nu views, where b is the rate at which the number of views changes. alb)" select the statement that would accurately describe the effect of tripling a, the initial number of views before jackson beginst the rate at which the number of views changes, b, will triple. the total number of views the video has after n days, a(b)", will not change. the total number of days since jackson begins tracking views, n, will be reduced by one-third. the total number of views the video has after n days, alb)", will triple. submit