Nora is a video game designer. She believes that games played using virtual reality headsets will be perceived by students as more challenging. She proposes an experimental study to examine this belief.

Facial shaving brushes are either bulb-shaped or fan-shaped. an experiment is to be conducted to determine whether the lather thickness is the same for both types of shaving brushes. in previous studies, it was determined that shaving brush size (small, medium, large) is associated with lather thickness, but shaving brush type (wolf whiskers, maggard razors, frank shaving, and so on) is not associated with lather thickness. how could the experiment best be conducted? by blocking on shaving brush size by blocking on shaving brush type by blocking on shaving brush shape by blocking on lather thickness without blocking

Doing a science fair project should i do cafeteria waste or solar power

What is a system where wealth and property are privately held and profit is the goal rather than providing for collective needs? a. capitalism b. socialism c. communism d. feudalism