Indicate Whether the Study Described Is an Observational Study or a Controlled

question 11

Multiple Choice

Indicate whether the study described is an observational study or a controlled experiment.
-Researches want to find out which U. S. movie has the most positive audience reaction for the current week. As they exited a randomly selected movie theater, movie-goers were asked to give the movie they had just viewed a letter grade of A, B, C, D, or F. In this scenario, the movie-goers
Are an example of a_{--------------------} .

• A) Population
• B) Sample
• C) Variable

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Definitions:

Rickettsiae

A genus of bacteria that are the causative agents of various diseases, including typhus and rickettsialpox, and are typically transmitted by lice, fleas, or ticks.

Mycobacteria

A genus of bacteria known for causing diseases like tuberculosis and leprosy in humans.

Wet Mount

A preparation of a specimen in a liquid that allows the organisms to remain alive and mobile while they are being identified.

Mordant

A substance, such as iodine, that can intensify or deepen the response a specimen has to a stain.