Researchers with the State Department of Natural Resources (DNR) Wish

question 45

Multiple Choice

Researchers with the state Department of Natural Resources (DNR) wish to estimate the mean flow rate of water through a stream.From previous research conducted on similar streams, they know that the variance of flow rate is 27,556 gpm2.If the DNR researchers wish to create an interval that they are 99% confident will contain the mean flow rate with a bound on the error of estimation of 40 gpm, how many flow samples do they need?

• A) 114
• B) 3,148,739
• C) 165
• D) 115

---

Definitions:

Kinetic Depth Effect

A visual phenomenon where the motion of an object reveals its three-dimensional structure.

Motion Parallax

A depth cue in which objects closer move faster across the visual field than objects that are further away, creating a sense of depth.

Movement Illusion

An optical illusion where a static image appears to be moving due to the cognitive effects of interacting color contrasts and shape position.

Texture Gradient

A visual cue used to convey depth in an image, suggesting that an object's texture becomes denser and finer as distance increases.