Life Tests Performed on a Sample of 13 Batteries of a New

question 83

Multiple Choice

Life tests performed on a sample of 13 batteries of a new model indicated: (1) an average life of 75 months, and (2) a standard deviation of 5 months.Other battery models, produced by similar processes, have normally distributed life spans.The 90% confidence interval for the population mean life of the new model is _________.

• A)66.78 to 83.23
• B)72.72 to 77.28
• C)72.53 to 77.47
• D)66.09 to 83.91
• E)73.34 to 76.25

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Definitions:

Hierarchical Integration

A concept in psychology that suggests complex cognitive processes are formed by integrating simpler ones into a structured hierarchy.

Proportional Changes

Adjustments or alterations that maintain a consistent relationship or ratio among components or between an individual component and a whole.

Menarche

A girl’s first menstruation.

North American Newborn

An infant born in North America, often referring to the health, social, and environmental aspects specific to this geographic region.