A Student Wanted to Construct a 99% Confidence Interval for the Mean

question 1

Multiple Choice

A student wanted to construct a 99% confidence interval for the mean age of students in her statistics class. She randomly selected nine students. Their mean age was 19.1 years with a sample standard deviation of 1.5 years. What is the 99% confidence interval for the population mean?

• A)[17.42,20.78]
• B)[17.48,20.72]
• C)[14.23,23.98]
• D)[0.44,3.80]

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Definitions:

Obsessive-Compulsive

A disorder characterized by unwanted repetitive thoughts (obsessions) and/or actions (compulsions).

Panic

A sudden, overwhelming fear that triggers severe physical reactions when there is no real danger or apparent cause.

Dissociative

Related to a disconnection or separation of perception, identity, memory, and awareness, often as a response to extreme stress or trauma.

Somatoform

Relating to a group of psychological disorders characterized by physical symptoms without a clear physical cause, often thought to be linked to mental factors.