A Laptop Battery Lifespan Follows a Normal Distribution with Mean $\sigma$

question 66

Multiple Choice

A laptop battery lifespan follows a normal distribution with mean μ = 20 months and a standard deviation $\sigma$ = 6 months.To test the alternative hypothesis that μ > 20 with α = .05, 36 laptop batteries are randomly selected.Assuming that μ = 21, the probability of type II error is approximately ________.

• A)0.00
• B)0.2595
• C)0.2036
• D)0.6449
• E)0.7405

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Definitions:

Thoracic Region

The part of the body that is located between the neck and the abdomen, housing the heart and lungs among other vital organs.

True Ribs

The first seven pairs of ribs, which are directly attached to the sternum via costal cartilages.

Vertebral Curves

The natural curvatures in the spine that help absorb shock and maintain balance in the human body.

Flexibility

The ability to move joints through their full range of motion; important in fitness, wellness, and preventing injuries.