What Is the 95% Confidence Interval for the Standard Deviation $08 < \sigma < 2.1$

question 64

Multiple Choice

What is the 95% confidence interval for the standard deviation of birth weights at Guelph General Hospital, if the standard deviation of the last 25 babies born there was 1.1 pounds?

• A) \(08 < \sigma < 2.1\)
• B) \(0.7 < \sigma < 2.3\)
• C) \(08 < \sigma < 1.9\)
• D) \(09 < \sigma < 15\)

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Definitions:

Standard Deviation

It measures the dispersion or spread of a data set, indicating how much the values in the set deviate from the mean on average.

Postformal Thought

A proposed adult stage of cognitive development, following Piaget’s four stages, that goes beyond adolescent thinking by being more practical, more flexible, and more dialectical (i.e., more capable of combining contradictory elements into a comprehensive whole).

Operational Thought

A stage in Piaget's theory of cognitive development where children develop the ability to think logically about abstract concepts.

Concrete Thought

Thinking that is literal and focused on the physical world, often observed in early cognitive development.