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Author Question: The degrees of freedom for a 2 by 2 chi square must always equal a. 4 b. 2 c. 1 d. none of ... (Read 41 times) |
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.