Need this asap, I know someone out there got me : ( Physics kinematic practice

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs

What describes the particles in a liquid