The Use of Carpeting in Hospitals, While Having Aesthetic Value

question 10

Multiple Choice

The use of carpeting in hospitals, while having aesthetic value, raises an obvious question: Are carpeted floors sanitary? An experiment comparing airborne bacteria levels in carpeted rooms with that in uncarpeted rooms was performed in an effort to answer this question. Specifically, for each of eight carpeted rooms and eight uncarpeted rooms in a hospital, the number of bacteria per cubic foot of air was measured. The data are given below. Assume that room sizes are equal, and that the 16 rooms in this experiment were assigned randomly to the carpet and no-carpet groups. The researcher is interested in testing H₀ : no difference in distribution of bacteria counts for carpeted and uncarpeted rooms, against the one-sided alternative H _a^: the carpeted group tends to have higher bacteria counts. If W, the Wilcoxon rank sum test statistic, is the sum of the ranks assigned to the carpeted group, then the P-value for the test is:

• A)0.046.
• B)0.248.
• C)0.496.
• D)0.752.

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Definitions:

Descending Track

Neural pathways that transmit impulses from the brain down the spinal cord, influencing motor control and sensory information.

Central Canal

A narrow channel running along the center of the spinal cord, containing cerebrospinal fluid.

Sulci

Grooves or furrows on the brain's surface, separating adjacent gyri in the cerebral cortex.

Cerebrum

The largest part of the brain, encompassing areas responsible for processing sensory information, motor functions, and advanced brain functions such as thought and emotion.