A Researcher Interested in Observing Sleep Patterns Asks People to Come

question 19

Multiple Choice

A researcher interested in observing sleep patterns asks people to come into her sleep laboratory so that their sleep behaviour can be systematically monitored.One of the things she is interested in is the relationship between the number of times a person rolls over in the night and their ability to perform a range of cognitive tasks the following day.If the shaded bars in the graph below represent the number of times a sample of 25 people roll over in the night, which of the following statements is true?

• A)The distribution of number of rolls is negatively skewed.
• B)The modal number of rolls is 3.
• C)The mean number of rolls is 2.
• D)The median number of rolls is 2.
• E)The mean is probably the most appropriate measure of central tendency.

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Definitions:

Nasopharynx

The upper part of the throat located behind the nose, which forms part of the respiratory system.

Laryngopharynx

The part of the pharynx that lies below the epiglottis and above the esophagus, involved in both respiration and digestion.

Trachea

The windpipe, a tube that connects the larynx to the bronchi of the lungs, allowing the passage of air.

Glottis

The part of the larynx consisting of the vocal cords and the slit-like opening between them. It plays a key role in producing sounds.