The Double-Blind Procedure Strengthens the Internal Validity of a Study

question 286

Multiple Choice

The double-blind procedure strengthens the internal validity of a study because

• A)it minimizes the effect of experimenter or participant expectations on the outcome of an experiment
• B)it creates more confounding variables in the experiment so the experimenter can be assured of validity
• C)it eliminates the problem of the participants' social desirability bias
• D)it insures that a given sample is representative of the population from which it is drawn

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Definitions:

UTIs

Urinary Tract Infections, which are infections in any part of the urinary system, including kidneys, bladder, ureters, and urethra.

Gram-negative

Bacteria that do not retain the crystal violet stain used in Gram's method of staining, indicating a specific cell wall structure.

Gram-positive

Bacteria that retain the crystal violet stain used in the Gram staining method, indicating a single thick cell wall, which is important in classifying bacteria and determining appropriate antibiotics.

Enteric Bacterium

Any bacterium that inhabits the intestinal tract, often referring to those that are part of the gut flora or pathogens causing gastrointestinal diseases.