DrJohnson Hypothesizes That NutraSweet Reduces Short-Term Memory

question 6

Multiple Choice

Dr.Johnson hypothesizes that NutraSweet reduces short-term memory.In order to test her hypothesis she gives 10 subjects a beverage containing NutraSweet (treatment group) and 10 subjects a beverage without NutraSweet (control group) .She then measures the subject's ability to recall a list of numbers.In this study the independent variable is _______and the dependent variable is______.

• A)whether the subjects received NutraSweet or placebo: recall for a list of numbers
• B)recall for a list of numbers: whether the subjects received NutraSweet
• C)the subjects ability to recall: the drink with NutraSweet
• D)Both b & c
• E)None of these

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Definitions:

Conical Surface

A surface that extends outward and away in all directions from a common point, resembling the shape of a cone.

Frustum

A truncated shape that results from cutting a pyramid or cone with a plane parallel to its base, leaving two bases, one smaller than the other.

Pitch Angle

The angle between the helix of a thread or gear on a cylindrical shaft and an imaginary line perpendicular to the shaft's axis.

Pitch Cone

The imaginary cone that defines the pitch surface of conical gears or screw threads, where the common vertex of the gear teeth or threads would converge.