In Cases of Noncommunicating Hydrocephalus,why Does Excess Cerebrospinal Fluid Accumulate

question 25

Multiple Choice

In cases of noncommunicating hydrocephalus,why does excess cerebrospinal fluid accumulate?

• A)Absorption of CSF through the arachnoid villi is impaired.
• B)Excessive amounts of CSF are produced in the ventricles.
• C)An obstruction is present in the aqueduct of Sylvius or other channel.
• D)Flow around the spinal cord is blocked.

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Definitions:

Test Statistic

A calculated value that is used in statistical testing to decide whether to reject the null hypothesis, based on the possible values it can take in relation to a theoretical distribution.

Rank Sums

A statistic used in non-parametric tests that involves summing the ranks of observations in samples.

Standardized Test Statistic

A calculated value from sample data that has been transformed to conform to a standard scale, used in hypothesis testing to determine how far a sample statistic differs from what is expected under the null hypothesis.

Matched Pairs

An experimental design where pairs of subjects are matched based on certain criteria to compare effects of different treatments.