A Researcher Believes That the Median Annual Rainfall in the Valley

question 56

Multiple Choice

A researcher believes that the median annual rainfall in the valley is about 36.0 inches. A randomly selected sample of 20 years had the following numbers of inches of rainfall in the valley:
19) 2, 20.8, 22.5, 25.1, 27.1, 27.3, 31.0, 37.2, 37.7, 39.0, 41.1, 42.4, 45.7, 49.0, 49.8, 50.9, 53.1, 55.3, 61.2, 65.8
Test the researcher's hypothesis at α = 0.05.
You may use the following abbreviated table of critical values for the sign test (two tailed, = .05) , taken from Table J in the text:

• A) Reject, because the test value 6 is greater than the critical value 4.
• B) Accept, because the test value 7 is greater than the critical value 4.
• C) Reject, because the test value 6 is greater than the critical value 5.
• D) Accept, because the test value 7 is greater than the critical value 5.

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Definitions:

Tranquillisers

Medications used to reduce tension or anxiety, often affecting the central nervous system to induce calmness.

Antianxiety Drugs

Medications used to treat anxiety disorders by reducing symptoms of anxiety.

Antipsychotic Drugs

Medications designed to treat symptoms of psychosis, including hallucinations, delusions, and disturbed thoughts, commonly used in schizophrenia and bipolar disorder.

Hallucinations

Perceptions in the absence of external stimuli, such as seeing or hearing things that aren't there.