Exhibit 11-1 Last Year, the Standard Deviation of the Ages of the of the Students

question 20

Multiple Choice

Exhibit 11-1
Last year, the standard deviation of the ages of the students at UA was 1.8 years. Recently, a sample of 61 students had a standard deviation of 2.1 years. We are interested in testing to see if there has been a significant change in the standard deviation of the ages of the students at UA.
-Refer to Exhibit 11-1. At 95% confidence the null hypothesis

• A)should be rejected
• B)should not be rejected
• C)should be revised
• D)None of these alternatives is correct.

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Definitions:

Down Syndrome

A genetic disorder caused by the presence of an extra chromosome 21, characterized by physical growth delays, characteristic facial features, and mild to moderate intellectual disability.

Down Syndrome

A genetic disorder caused by the presence of all or part of a third copy of chromosome 21, characterized by distinct physical features and intellectual disability.

Dominant Inheritance

A pattern of inheritance where a single copy of a dominant allele on one chromosome is enough to produce the phenotype.

Huntington's Disease

A hereditary neurodegenerative disorder characterized by motor, cognitive, and psychiatric symptoms.